I am not sure how grips are installed on handlebars, so I used the technique I use to install golf grips. Of the ones I have taken apart, it seems like alot of duct tape is the norm.
I had some double sided sticky tape, like masking tape. Here is an example:
http://www.randmh.com/php/page.phtml?page=0826
1. Remove old grips and clean handlebars, wipe down with acetone/lacquer thinner and clean all residue from bars.
2. Put the double sided sticky tape on the bars, I had to use two strips of 3/4 tape. If you have gorilla size hands you can layer more tape.
If using old grips spray some cleaner on the inside of the used grips, let that dry if new grips go to next step.
3. Pour mineral spirits into the grip and then put your finger on the outside hole and pour mineral spirits onto the tape. This makes the tape gooey and slippery,
4. Slide the grip over the tape and let dry in 70 degree weather for at least an hour. Colder areas take longer I am sure. This keeps a golf club grip on so I dont see why it would not work. I also did one for on my friends street bike.
So easy even a caveman could do it.