Not something i wanna do for living so i learned on my own. Gotta start taking things apart and working on different cars to realize how its really just alot of common sence stuff. Diag ect. Can get to be tricky without correct tools but just take time and confidence.
You could watch a mechanic do something amillion times an still do it yourself an be iffy about doing it right or not... start by doing some simple things like trans pulls to get comfortable using tools then do a 60k kit on your z with a write up and youll notice how easy it is. No need for school to learn basics. My opinion anyways. Your not trying to work on 2013 Mercedes or bmws with crazy electrical, our zs are pretty strait forward to work on.