learn from others fu#k ups
Never jump straight up in the back of a pickup that's parked in a shed with a low overhead roof!
When removing a fender with an impact gun, never reach behind and grab the welded nut if it hapens to break loose. (It's like sticking your hand into a blender!)
When changing the timing chain in a small block never forget and leave off the fuel pump eccentric or you'll be running an electric fuel pump for the rest of the car's life!