I have no idea!!!! No. My father is a master electrician/auto mechanic my uncle was a machinist/automotive aluminum parts developer/tester for reynolds metals, my grandfather was a watch smith. And I am finishing up my BS in eletrical engineering.(I didn't start college till I was 28) I have just always been around it and excited to learn and do. Growing up, I got tools for x-mas starting at age 9? - 10? I have worked for mechanics in the past, built several homes for family and friends. I do a LOT of research and take my time. Learn when ever I can from whom ever I can... And screw up a lot. Thats how I learn.
Also most things are all the same. Well they work on the same principles, at the level I work on them atleast. So with a basic understanding and the ability to apply that understanding to different things, makes most things learnable and dooable. That and be willing to screw everything up and ask dumb questions.
Well other then spelling. I am a terrible speller.