I learned from a few woods wise folks and went out for plenty of practice and self learning adventures.
I've heard some about Tom Brown and I'm thinking next year I'll try and take his course that he gives here in California at Boulder Creek.
Attended a flint knapping, atlatl and bow making rendezvous a few years ago and learned plenty just by watching the experts and asking a few questions. Cost was $10.00 a nite to camp, plus gas and food.