If I were you i would just wait on the water pump until you have to replace it. But I will post it anyway. Of course drain the cooling system completely before you start. Remove the cooling fan and shroud. LOOSEN THE BOLTS ON THE PUMP PULLEY AND THEN PULL THE DRIVE BELT OFF. Detach the hoses from the water pump. (If you have the original factory alligator clamps then i would go ahead and replace them with the screw type). You may have to take the alternator bracket off to get the pump out. remove the bolts from the water pump (8 for the V8 and 12 for the V6).
Make sure that you pay attention to where each bolt goes as some are different lengths and sizes than others. If the water pump won't come loose by hand then smack it with a rubber mallet a couple times. Now go ahead and take off the pulley. Keep the bolts and pulley as you willl need it for the new pump. Remove all of the old gasket from the engine and then clean the surface of the engine and the bolts with lacquer thinner or acetone. Now put a thin bead of RTV sealant all the way around on the side of the gasket that is going on the engine. Next put the gasket on the engine and just stick a couple bolts through to hold the gasket on the engine. Now put a thin bead around the mating surfaces of the water pump. Then install the water pump. Make sure that you do not tighten them up to much or the pump will warp and you will have a leak (V6 is at 72-108 inch-lbs and the V8 is 15-21 ft-lbs).
Reinstall everything including a new belt. Once you get the belt on you can reinsatll the pulley and tighten it down. Make sure you refill the coolant. And then run the engine and check for leaks.