You're right. Jumping into that airplane would probably be a big mistake. Aside from the actual handling of the airplane, spraying crops isn't simpy a matter of flying low or avoiding obstacles.
Spraying requires a working knowledge of crops, chemicals, and regulation. It requires an understanding of the liabilities and implications, and some very precise operation.
Overspray and crop damage issues are critical. Put down a herbicide, and you may be responsible for every crop for 50 miles in any direction. Someone ten miles away complains that their trees died as a result of your application. Is that true? How do you prove it? It only takes one or two drift claims to shut you down and put you out of business, as well as lose everything you have.
Consider that statistically, the average spray pilot has a seven year lifespan. That means that a lot of pilots go a very long time and have a good spray career. It also means that a lot of new pilots don't survive their first season or two.
You should have an ag background, or a solid understanding of the needs of the farmer. You should understand the crop. You may be called on to visit the crop and make recommendations on chemical, treatment, etc. You need to have an understanding of entimology, including all the pests and predators you're dealing with, their lifecycles, and how they affect the crop, as well as benificial insects, environmental impacts, etc.
Bear in mind that when you climb into that Agtruck or Weatherly, there's nobody to check you out in the airplane. Coupled with no conventional gear experience, you're asking for a boat load of trouble. Couple that with winds, wires, obstacles, and inflight emerencies, and you're jumping without a parachute. You may do okay if everything goes according to plan...but then what happens when something goes wrong? It will.
When you enter a field over obstacles, you must be very precise in turning on and shutting off your chemical. Your rows must be precise. You cannot have gaps. You must be within inches vertically, and horizontally on every single row. Leaving skips in a field will sink your reputation as fast as anything, and in the ag aviation business, you're still building your reputation 15 years after you arrive in a given area...you're still considered the "new guy." Skip up a farmers field and leave green streaks in his spring wheat...and you've cost him an entire crop, or lowered his crop value to where it's not competitive.
When you enter the field, you can't get the spray to the edges of the field. That requires cleanup passes. That means you're going to be flying the borders of the field, in very close proximity to powerlines. How comfortable do you feel attempting to make these passes, with your wingtip a few feet from powerlines, while flying only a very short distance above the crop, while looking for obstacles, dealing with winds, and ensuring that you have a precise path over the ground?
You'll most likely be using satallite navigation now, a satloc or similiar system. with an external light bar working somewhat like a CDI, you're going to be flying it like a localizer. Can you imagine flying the localizer at six inches above the ground at cruise speed? Wanna try at a thousand hours in an unfamiliar airplane loaded to gross in winds and weather and in a hot cockpit while choking on pollen and chemical vapors? Something to think about.
Are you prepared to work on the airplanes you fly? You need to know your systems with intimacy. Not just well, but with intimacy. You need to be able to work on them. Be prepared to become an aircraft mechanic. Most ag pilots are.
When you're spraying in the morning, you'll be flying back through the spray. Your windscreen gets coated very quickly. You won't be able to see out the front of the airplane, especially if spraying atrazine or chemicals like 2,4-D (which is on the rapid decline in most places). The windscreen just turns white.
You end up flying with one hand, and leaning forward through a little side window to wipe a little 6"X6" spot to see out of...and that's how you fly the remainder of the flight, while maintaining your row spacing, height, and clearance from powerlines, etc.
You get to mix chemical. If you aren't familiar with organophosphates such as Parathion 8E or Dimethoate, they're bad news. A single drop on your tongue out of the barrel can kill you. Remember the movie, The Rock? The nasty green stuff in the little spheres that killed everybody horribly? Same stuff. Only you don't get chemical protection gear, and when it's beening dispensed in the field, you're the guy out there flying around it, through it. Something else to think about.
Aircraft nozzles get plugged up. You need to be able to fly the airplane as well as look down and behind you frequently to watch your spray pattern and ensure that your nozzles are performing properly. You need to be able to work on them, and you'll be adjusting, changing diaphrams, the whole nine yards, during the spray day.
This just scratches the surface, but it gives you perhaps an idea that it is NOT simply a matter of just getting in the airplane and going flying. Ag work is not an entry level job for the most part. Back in times when it was conducted that way, to some degree, the fatality rate was a whole lot higher, too.
If you have highly experienced ag pilots who are willing to take you on board and break you into the business, then that's one thing. If a family member is going to toss you in the cat and tell you to go spray a field, that's another matter completely and I'd back away from that as fast as you can run.
At a minimum to start, someone needs to get you in a cub or other such airplane and spend 20 hours of so working you in the field, teaching you about turns, etc. You'll learn that what the popular masses call the "downwind turn" and call a myth, is pretty darn real, and it can kill you. Are you comfortable doing steep turns at 75' in an airplane loaded to gross, and pulling them tight enough to feel the airplane buffet? It's part of the game, and the ag turn kills people. There is no room to recover if you make a mistake, and when you're working, these aren't just the occasional turn. You'll be doing it every 30-60 seconds of the day. Shaving a few seconds off the turn is a big deal...it's the difference between profit and bankrupcy.
There are no benifits, and insurance is hard to come by. The last few years have been tough on ag pilots and the ag aviation industry. Lots of businesses up for sale, and these by experienced hands. Something else to think about.
Every flown an airplane that's heavy enough you can't climb over powerlines after takeoff? You will. Ever flown under powerlines? You will. Ever had a wire strike, or faced the very real possibility of being involved in a serious accident? You probably will. Given a little time.
Getting into the business is certainly doable, and if it's what you want to do, then go for it. Heaven knows that the industry can always use new blood. But be sure it's done responsibly by those who are going to break you in easily, and carefully. Just being handed the airplane and told to go to, will probably get you killed.