If has a screw in the bottom I would do the following:
Unload weapon, remove screw, hold grip in right hand and frame in left and gently try to rock the grip ever so slightly fore and aft while applying light downward pressure. Once the grip loosens up, slowly remove the grip, taking care to catch the grip locating pin should it fall free. On Hogue 1 piece wood grips for j-frames, the original S&W locating pin is replaced with a shorter pin and they are not always interference fit. It may drop out and bounce to the netherlands if you're not expecting it.