What is the best way to put on a serpentine belt on a Mercury Sable?

your local parts store can give you a free print out of the diagram. but if you know that and want the easiest way to put it on, i find it better to release the tensioner pulley a bit , pulling it forward, putting the belt on, then putting the tensioner pulley back where it was. now be careful putting it back. it may snap back at you, n i tellyou what, that's smarts! but yanking the belt to put it over that alternator takes your entire body strength. there really is no easy way. its a pain in the *** on any car.