Remove the Serpentine belt. Pull the bolts that hold the water pump in place (5 or 6, something like that). Then the water pump should pull out of the block. It may be held in place with some gasket sealer, so once you have the bolts out you can pull hard on the pump. Remove the pulley by turning the 3 bolts. Put it all back together in reverse order. You may need to remove a couple parts to get to the pump.