How hard to change hand grips on a bike?

[DebW]

Shhhh. Don't say this too loudly, but the secret to removing and installing grips is....

hair spray

Get one of those red plastic straws that fits on aerosol spray cans, put a tiny screwdriver under the grip, put the straw inside, and squirt. Wiggle it back and forth, spray further inside if you need to, and it will slide right off. To install the new grips, spray inside lightly and slide them on. In most cases, they will be firm in a couple minutes. If they keep sliding, you used too much hairspray, so slide them off, wipe inside with a rag, and try again.