I regret relying on the vehicle i am working on and not having a second to run for parts or tools. I regret not treating myself to good tools, especially an impact gun. I regret that i abused my back and now i have to be aware of how i sit. I regret anytime i try and get away with buying cheap parts, or not replacong stuff while i’m in repair mode. I regret anytime i ever put force on a socket with something not soft on the other side of my hand. 😁