All of the above posts are correct, and accurate.
Flyinggal, unless you can go to work full time for 30 months as a mechanics assistant in addition to your flying duties, your only other path to certification as a mechanic will be night school or classes through your local community college. You can knock this out in 18 months to 2 years typically. If you can work as a mechanic, 30 months of full time work is required before being able to test for both the airframe and powerplant ratings (only 18 months to test for either one individually).
Back country work, referred to earlier, can be any kind of flying into remote areas, or areas less traveled. It often involves a lot of work on your own, with little support. It's frequently done at remote locations, off unimproved or poor airfields. Often dirt or gravel, often with no facilities, maintenance, etc.
With many former jobs, I've had to carry tools on board, and in some cases, parts. In a few cases, I've done repairs in flight due to the nature of the work.
Some remote area jobs are entry level, but many are not. In many cases, being a certificated mechanic isn't so much the issue, as one who can handle doing the work and getting the airplane home. It's a different kind of life, and a different kind of flying. The bottom line for the employer is can you do the job, and can you bring it home. Getting the signature is only a bonus.