Yes Timberframing can be learned by reading and doing.
I've been a woodworker for years and been around carpenters all my life. I really got the timberframe bug when I priced frames cut by someone else, ($45K). It took me 1000 hours over the course of 12 months to cut the frame for my house, ~14000 board feet of timbers and hundreds of joints. The first few timbers were slow going but after a few weeks you start to get proficient and develop a rythem. I actually planed and sanded all my timbers, cut the joints and then applied 2 coats of oil. The cost of tools, a part time helper, white pine timbers, white oak for pegs and oil was less than $10K.
Here are a few Timber Framer/authors - Ted Benson, Stewart Elliot, Eugene Wallas, Jack A. Sobon.
I honestly think the classes/workshops are over rated and over priced.