I just got done replacing my power steering pump, and it is a pain in the ass! However, just tightening the belt isn't too hard.
1. Looser lug nuts of front right wheel, raise car on jack stands, and remove front right wheel.
2. Remove two bolts that are holding on the fend shroud. Once this is removed, you will be able to see the main drive belt and the power steering belt.
3. Loosen the bolt (14mm I believe) that is in the adjustable bracket.
4. You may be able to move the pump and tighten the belt by just loosening this screw, however you may need to loosen the other adjusting bolt.
5. After you have adjusted the position of the pump and tightened the belt, retighten all bolts!
See here for more info:
http://www.autozone.com/addVehicleId...00c152801ccf7a