Well if anyone's interested my take is that you can't beat tuition from someone who really knows their stuff.
When I was younger and considerably fitter
I practiced Ju Jitsu. My Sensei was a chap called Derek Fairhurst, and he was an extremely good instructor.
Derek wasn't in it for the money. There was no 'belts' and grading fees. You got your next belt when you deserved it and were ready, and not just because you turned up every week and paid your money.
All these 'belts' are a western invention to make money and because we are impatient for progress. In Japan you could be a white belt for years and then when (and only when) the Sensei thinks you are ready will you try for your black belt. It could take literally 30 years of hard practice. (well that's true in Ju Jitsu anyway. I don't know about the other martial arts) The Ju Jitsu black belt in Japan is reverred.They deserve to be, they've put in years of extremely hard work.
You simply can't learn to be proficient in bushcraft from a book or watching DVD's. Sure you can learn a certain amount from self study and certain media but you can't better learning from someone who knows their onions. You can ask questions and ask opinions and if you're stuck ask for guidance. It's a bit like trying to learn a language from a casette or CD. You need to have lessons to really learn or go to that country and live there for a while.
I've done most of my courses with John Ryder of Woodcraft school, and I keep going back to Woodcraft because John and his Staff Nick Ward especially know their onions. Great respect for those folks.
And if you're short of dosh as I am............go get a bozzo job to pay for tuition and then you're on target for your dream of being a teacher. (You can get it, if you really want it) I've done some really pants jobs in my time. Volunteer for Army cadets or Air Cadets as a Civilian Instructor. You don't get paid but I got a BELA (Basic expeditionary leadership award) for free. First Aid Certificate etc............ for nothing.
Think outside the box too. (yes I know, Cr@p corporate expression) All the schools do courses for folks but how about specialising for certain groups. EG mobility impaired folks, mental health issue people, ex- addicts. You don't have to teach advanced bow making, or flint knapping, or brain tanning. Just the simple stuff is enough for some groups. I spent a day teaching 'tagged' teenagers a couple of years ago..........flipping hard work.......until I showed them a stinging nettle and told them this plant will get you high! then they became interested. Incredible but true. They didn't even know what a stinging nettle looked like.
Anyway my advice is learn all you can from books of all kinds, and get on courses even if you have to flip burgers to pay for it. think of something original for the non mainstream type of folks and you'll be there. Your only hinderance will be lack of ambition or imagination.
As the old Aswad song goes.............you can get it if you really want!