Installing New Grips
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Installing new grips is actually really easy. I say it can easily be done in 5 minutes. Start by removing your bar ends, an allen wrench should be all you need.
Next using a sharp razor blade/knife, carefully cut the grip, and only the grip. I cut upwards, and away from myself, to ensure I don't scratch up the clip on. Be careful! Usually once you get 3/4 through you'll probably be able to pull the grip off no problems.
You need hairspray.
Holding a rag under the clip on, spray the hairspray all the way around the clip on. Soak it, don't be shy with the hair spray. Keep the rag over your plastics until you are done installing the grip, so hair spray doesn't get on your paint. I also spray the inside of the grip as well, again don't be shy with the hairspray. Now slide the grip on, it should go on fairly easily.
You have a very short time window to adjust the grip as needed. Make sure it is straight and not twisted, as once it dries, it won't come back off easily. Also quickly install your bar end to make sure the grip is in the correct location. If it needs to be pushed on further, or pulled back some, do so quickly.
On the throttle side, you should find a plastic washer, make sure you leave this in place. This will help prevent the grip from sticking to the throttle cable housing. Also on the throttle side, don't push the grip all the way on, there should be some gap between the grip and throttle cable housing. After installing the grip, install your bar end, and twist the throttle and make sure it snaps back. If it rubs anything at all, it needs to be fixed quickly before it dries. Check to make sure your throttle returns several times, with the bar end installed.
After installing the grips, they should be dry within ~30 minutes on a warm day. They shouldn't slip or twist at all. I usually try not to ride the bike until the grips have dried fully.