My friend was a hair colorest at a upscale salon in NYC. She couldn't take the chemicals and decided to train people. She didn't have any experience beyond the basic cardio 3 times a week. Now she's making 100 bucks a session in NY. Financial success in P.T. has NOTHING to do with what you know.
I say this everytime this topic comes up and it couldn't be more true:
The most successful trainers aren't neccessarily the best trainers, they're the best salespeople.
75% of PT clients are just looking for accountability, someone to show up and work them out (however that may be).