You should already have a strong foundation in place with regards to your knowledge areas, ability, flying skills, etc. Now it should just be a matter of "fine tuning" your flying and getting comfortable with the controls from the right side and being able to "teach" from that side. It should be a relatively easy and painless transition for you for the most part, I don't think this ride was anymore easier or difficult than my initial 135 captain ride with the feds. You either know your stuff at this point or you don't, hopefully you do. A "positive" attitude and hard work ethic will go a long way as you start your climb up the instructing ladder. I would spend as much time as you can reviewing the fars/aim, wx related material, faa handouts, signoffs, etc, etc, since the majority of the checkride will be spent on the ground doing the oral portion of the checkride. The FAA already knows that as a "commerical pilot" that you can safely handle the aircraft, they are mainly concerned that as a CFI that you can safely teach/instruct in a controlled environment without compromising the safety of the flight at any point. The flight portion of the checkride should be the easy part, most get pinked on the oral portion since this is where the FAA is really going to drill you on just about everything and anything and make sure that you know your stuff. You should see absolutely no surprises on the flight portion of the ride, you have (or should have) done everything that will be tested and expected of you during your training. I thought the CFI ride was enjoyable for the most part and I was asked to do nothing that I hadn't seen in the past. Know the CFI PTS well and be able to do all the manuevers and objectives to the best of your ability within tolerances. When you finally get the CFI sign off then you should pass since your instructor wouldn't have signed you off if he./she had any doubts in his/her mind on your ability/skills.
I suggest that you find a CFI that has trained other initial applicants in the past who knows the ropes on what your local fsdo may or may not be looking for. This should be the same all across the board since everything within the PTS is "fair game" but the MCO and OKC fsdo's (and others) have been known to try and throw CFI applicants a curve ball during the oral portion of the ride. I did mine with the OKC fsdo and had a career CFI who signed off many other CFI applicants tell me exactly what additional things would be thrown my way, passed on the first attempt without a problem. I found it quite helpful to have someone who had many applicants take the ride with this specific fsdo, he knew the inspectors well and knew exactly what they were going to be looking for. A few of the others in my ground school had a younger CFI who was out of the loop and the failure rate with them was relatively high is comparison to the guy that I ended up with. Pick your cfi wisely if at all possible. I think "good" instruction is the key on whether or not you will get the desired and positive outcome. Ask around and get a feel for the instructors at your local flight school, obviously you are the customer so you reserve the right to be "picky" and "choose".
I would not worry about the checkride at this point, spend as much time as you can in the books and score as high as possible on the CFI written. The higher the score you get the easier the oral portion of the flight should be. Also make absolutely sure that the aircraft that you show up at the FSDO with has no AW problems and it is in tip top shape. I have met many who showed up with a "questionable" aircraft (that applicant and flight school thought was fine) that the FAA grounded and refused to fly in. I would have the checkride aircraft checked over and over by an A&P prior to making the journey for your checkride. The FAA has been known to find little things that are not overly obvious to most while doing a pre-flight.
Relax, enjoy, and most of all don't allow your nerves to get the best of you, sometimes this is easier said than done...
good luck,
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