How do you replace a serpentine belt on a 95 Ford Windstar minivan?

i have a 96 windstar, 3800cc, maybe about the same, take a long prybar to the slot on top of back component, maybe power steering pump on yours, it will be on a tension spring, push down. this should give enough slack to get the belt on or off, if not loosen the altenater bolts just enough to give another quarter inch.