There is a special tool that fits in the rear of the bushing and this is struck with a hammer, which forces the bushing out of the frame. When the bushing is forced out, it leaves a ring or burr, around the hole in the frame. Leave it. Line up the new bushing in the frame, in the exact same way as the old one was, and then using a steel rod, that is tapered on the end to fit the diameter of the bushing, and that also fits the bore diameter closely, tap the new bushing into the frame. You will then need a crimping tool that will force the ring or burr into and around the new bushing to stake it in place.
Probably best to have an S&W repair station do the work, as they should have the required tools needed.
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