Take the slide/barrel off. Be sure to remove the magazine. I have them on several Ruger handguns. I take an extra large coffee cup and put boiling water in it, then soak the grip for a few minutes (maybe 5 minutes). Then dry it with a paper towel and start pulling it onto the grip. Work it up a little at a time evenly on both sides. Be sure it clears the mag release and isn't hanging down below the bottom of the grip. Once it's on exactly as you want, be sure there is no residual water, and reassemble your pistol.