To be honest, I just watched a youtube video and figured I could do that. As far as the cut and reweld, I would steer away. Gas tank metal is very thin and unless you are working with a new tank, probably thinner in some spots due to rust. Blowing holes in a tank sucks, trust me. I just started with a piece of paper and a marker. Then started beating away. I think the trick is not to use a metal hammer and take your time. It seemed to me that the metal wanted to form that way. Mine is not perfect by any stretch, but not bad either. No creased!!! I was nervous too. This was a nice tank to start and I didn't feel like getting another. But sometimes you just need to go for it.