I have never had one done with a gun, so I don't know. But with a needle it depends on where you're getting it done. The industrial one wasn't painful at all, you just feel a little pinch when you get the second hole done. The vertical labret one hurt like hell though, it was like 5 seconds of the needle going trough my lip. It was so painful tears just started rolling down my face, but after those 5 seconds pass, it heals very fast and your lip is just a bit swollen for half a day or so, then it's good.