Consider reading the manual on a piece of equipment before blithely screwing things up in a confident burst of incompetence.
I once tossed a copy of a Haynes manual on a particular car to a mechanic who had screwed up work on that make/model and told him to do his homework before he touched another one. He did NOT like it. Don’t care. I didn’t like him. Heck, the Haynes manual was not nearly enough to cover all the intricacies of that car, but had he referred to even a Haynes, he would have had a really hard time screwing up as badly as he had. At the time, the manual was only $10, so I felt the snub was well worth it.