To remove things like grips, a Dental Spatula Number 324 can come in REALLY handy. Can slide it with WD40/Goo Gone in some pretty tight places to break things loose. I use alot of dental tools cleaning weapons and odd jobs around the house.
For the left grip I cut mine off, but any time I've had to save them in the past i've used a peice of copper tubing and compressed air to stick underneath and loosen it up from the bars, then just spray some WD40 or any kind of lubricant underneath it and slowly work it off with a screwdriver being carefull not to poke it through.
Thanks for the replies. \\; I was able to use screwdrivers to break most of the grip loose, and then twisted real hard to get it off. \\; Used the hairspray trick to install it on the new bars, an now I'm good to go!