Welcome!! I second the thought that learning by doing is nothing to be ashamed of. Not all of us were lucky enough to be able to go to school for something that we love. If there wasn't the exposure somewhere in people's past to technical aspects it is my impression that most people think it is just kind of "magic" how shows happen!!
Don't be afraid to ask as many questions as you can. Also, stray into some of the other threads. If you could figure out set building by doing, you probably would be great at sound, lights, SM, .....
Dennis