In the civil world, it is like this:
1. Selection - you need to have a pocketful of money.
2. Psychological Assessment - is this guy crazy enough to part with big bucks without having a job lined up afterwards?.
3. Put him through the course.
4. Try to squeeze a few more hours out of his bank account
If you pass that lot then you can qualify to instruct only after signing up for a Return of Service contract. Then work his @ss off because he is cheaper than the other Gr 1 or 2 instructors around.