Dave,

Sometimes it can be tapped out, other times, we use a small screw extractor inside the wrist pin. It grips and we then pull out the pin.

If it's a bit stuck, a bit of heat from a heat gun can help loosen it.

If the wrist pin is really stuck, due to burned-on fuel residues, sometimes the only solution is to cut the con rod. You can minimize chips by drilling a series of holes in the rod and then using nippers to cut through the bits left between the holes.

Cutting the rod is done only aa a last-ditch effort. Then the wrist pin can be driven out of the piston.