You could soak them with plusgas or parrafin before you start to bash em out , a good solid vice or piece of plate with a hole in the right side for the stud to fall through , one good hit with a b-big lump hammer , a deep socket may even do , as with all these jobs it all depends on what comes to hand first !
After you have fitted them keep checking them for a while until you are certain they are fully home after you have driven a few miles or so .
Best o luck .
Mike