"....our mistakes are one of the best ways to learn. "

Point made... but in many shops, like the 5 years I worked in a cabinet shop, and later doing a lot of woodworking at home, some mistakes can be serious. I'm not referring to just inattention, but to being unaware of certain applications of the laws of physics and 'how' certain materials behave under stress.
   I also just got a chain saw and am being VERY careful about how and where the saw is applied to a piece of wood.
In the same way, a mistake of NOT turning of the power when fixing an electrical item can be an **interesting** way to learn... ☺