Oh yeah i forgot... there's another way of doing it, when your old strings are on and in tune, get a peice if card board/ folded paper etc, and put this under the bridge (i dont think you can do this for floyd rose, but it does work for floating bridges), to stop the bridge from moving towards the body... then just tune down, take the strings off, put the new ones on, tune them up, and pull the card board out. You'll still fid them a little out of tune, but you only have to tune up once or twice more as opposed to sitting there for half an hour trying to get the damn thing in tune...