How to change a serpentine belt in pontiac grand prix gtp?

There should be a diagram under the hood showing the belt route.if not, draw your own picture.I would think installig the belt would be similar to most engines.most require a stout ratchet and socket to turn the spring loaded idler to allow you to bot remove and install.Another person is a great help as it is difficult to do both as the idler is tough to turn.