I worked with some pretty dangerous/powerful equipment and vehicles, chemicals, etc., with almost no training. At a very young age. i remember my first full-time job at a dairy farm (the summer before 9th grade!). He had me take a newly sharpened hay cutter to the field on a tractor. I took out a fence post and wire at the gate to the field. Luckily I did not cut my foot off (I was holding the blade down with my foot and it crossed the tractor like an airplane wing.)