The proper tool is a press. But some have OK luck drifting them with a brass punch. Not thew way I'd like to do it though. A smith should be able to do it while you wait.
But some won't unless they have good proof it's off which usually means either they shoot it or you are convincing enough that others have shot it or it's shot on a bench and is off with consistency. I think it's kind of rare for them to actually be off, especially on any good quality production gun.