Best advice I can give as a gearhead to the bone and as a master certified tech is erase any and all memories of any of the fast and the furious movies from your head. All three of these movies lay the BS on so thick that it was like watching a cartoon for me...lol. You have to remember these are hollywood movies and that is all they will ever be.

IMO the best way to learn is to start off as a tool monkey. Find out when someone you know is working on their car and offer to lend a hand. at first you will be doing nothing but fetching tools, but this will allow you to learn terminology and see how things are repaired without investing anything but time. :-)

Anyone who really knows what they are doing will be glad to explain what they are doing when they are doing it. And, remember, ask them ALOT of questions!