I BELIEVE that all models of Gold Wing have screw-on end caps for their handlebar grips. They are considerably longer than most people's hands are wide, for what reason I am at a loss.
1. Buy the replacement grips you like, and be sure that they are OEM. Gold Wing and Silver Wing bikes are quite persnickety about aftermarket parts: some will just not fit, no matter what you do.
2. Pull the end caps and save all the parts. Resist the temptation to pull the clutch cylinder: it is not a needful procedure.
3. Note the construction of the existing grips: many are chromed steel, with rubber pads -- much like a Harley wannabe. No, HD grips will not fit. Put the bike in a vise or at least on the center stand: side stands will not work for this operation.
4. Rubber grips: slice lengthwise with a stout blade knife tuned to a razor edge: the less force you apply, the less likely you will be to have the scooter atop you during the removal.
5. Steel grips: lube the inside liberally with penetrating oil. Use a hammer and chisel to pound the old grips off. If you can split them, it will save you lots of misery later. Be GENTLE on the throttle: it will not stand much abuse. It can be a wise move to remove both cables (mark the position of each with a string tag) and take the throttle into your shop where you can work bondage and discipline on the miserable thing with a vice.
6. Clean the grips with lacquer thinner, apply a liberal coat of polyester or epoxy glue, and slide on the new grips being careful not to let the glue drip where it should not go.
7. Reassemble.
8. Go for a ride!
9. If you have as much hassle with that as most people do, consider trading it in on a good used Harley. They're a lot less hassle to tinker on than Japanese junk.