Comment by wiredfool
See also: Chainsaws.
I used to do a decent amount with them, dropping trees and bucking them for firewood/thinning. Then started doing things like cutting chairs out of bigger logs. I caught myself onetime being really sloppy with where my hands were. All from doing it enough, and then doing something a little more complicated that I probably shouldn't have been doing.
There is a saying about aviation and danger that I am probably mangling. The dangerous times are at 100 hours when you think you know that you’re doing, and 1000 hours when you know you know what your doing.