It's kid stuff to me, but then I'm also not considering all of the high end stuff with which I have never had experience. Basics were covered by the age of ten just from necessity. I build engines, hydraulic pumps, etc now, but most of my knowledge was garnered through reading and practical application. I made a lot of mistakes, and still do often enough.
Apprenticeship is good to get experience, especially if someone doesn't mind paying for your screwups.