I have found that once you cut a slit in the grip it is easy to split and peel back and off. Also the tape usually comes off easily. If the tape does give you trouble a little of the activating solvent will loosen the glue.

Make sure when you are putting the new grips on you use lots off grip-solvent. I had one grip set up early on me giving me a real fit. I almost added a 1/2 inch to the club, but I finally worked it down.