Well, for removing old studs I have used an arbor press, or just a 12 pound hammer. If using a hammer, just put an old nut on the end of the stud to give a larger target. Both worked. For seating the new studs, I have used a nut, with several hardened steel washers, and grease on everything. It is not fast or easy, but it works. I always grease the washers and threads, because there is always a chance of galling a fine thread if you are not careful.