I am completely ignorant when it comes to mechanical stuff. I own some basic tools, and have done very minimal mechanical maintenance on my cars and around the house. I am interested in learning how to properly do some minor mechanical stuff on the plane, maybe spark plugs, oil changes and the like. I can ask my mechanic to show me, but he's pretty busy and I don't want to be a PIA. Plus I'd like to have some idea what I'm doing so I don't completely embarrass myself. What are some good ways to start learning about basic mechanical stuff for a complete neophyte? Thanks.