School of hard knocks ftw. My dad would show me some things, but he was also the kinda guy who got impatient and did the work himself while I "watched". I usually got bored and started looking for bugs.
At 13 or 14 I got hired by a neighbor to do some yard work for him. I get there and he had a fallen tree that needed to be cut into sections. He handed me a chain saw and asked if I'd ever used one, I had not. So I got some quick instruction on the dos and don'ts and he watched me make a cut or two. After that I was on my own, no ear protection, no safety glasses, pretty sure I was wearing shorts. I got that tree sliced and diced and didn't lose any body parts. I was quite proud of my work but I think my parents were not as excited about me using a chain saw mostly unsupervised as that age, so I never did get more work from that neighbor.