It's a stupid question, but where do people learn this stuff?
Some learn at home. I have some old lumber that I will use to brush up on my skills--things like riding across a 2x6, lifting a tire over a post, doing a drop off from the deck, and anything else I can create here in the comfort and privacy of my home. Then I head over to the trail and put my skills to work.

Is there someone at the LBS who can give you a private lesson?