How do you change a belt on a 1999 Dodge Caravan?

I am not a mechanic but saw my mechanic change it on my car. Go underneath the car. One of the pulley wheels the belt goes through needs to be pried back with a screw driver or something similar to release the tension on the belt. Only one of the pulley wheels will move, so try each one. On my car, the pulley was slightly rusted, so he WD 40'ed it first. It was still a little stiff, and he had to use a lot of elbow grease. Remove and replace belt. Good luck.