I installed the clutch side, last night. Got the stock grip off without cutting it or using a compressor. Just peeled it back about 1/4 way and started tugging. Took a while to get it off, but it's in one piece and can be reused if I choose to (my hands hurt, today, lol).
I did a test-fit of the Murphs by spraying the bar and inside of the grip with water and they slid right on as easy as could be.... Unfortunately, this did not prepare me for the real-thing. I wrapped my bars with a few layers of electrical tape -- partially to insulate the bars and reduce heat transfer, but also to make them a smidge thicker. I then installed my heating elements. I went with the Moose Racing kit, since it appears to be identical to the Symtec kit that was recommended to me, and I got it for $35 which seems quite reasonable -- included switch and all the wiring. Unfortunately, the grips don't slide well over the heating elements, and electrical tape appears to act as some super-adhesive with the grips. Took me an hour to slowly squeeze the grips on.... Basically compressing the end, then stroking the grip to pull it in the desired direction. Progress was very slow. But I finally got it on there. I'm hoping that they stay in place and don't twist or move.
Still have to do the throttle side, tonight. And all of the wiring/switch installation. I hope the throttle tube is strong enough to handle the abuse of getting the stock grip off, and installing the new grip. I'd hate to break it.