Originally Posted by GonneVille
First, you don't need to do anything with the idler pulley. Slap a socket on the tensioner behind the */C pulley and use a breaker bar or a ratchet with a helper bar to pull it over, and the belt will just slip off the pulley. Same thing for putting the new one on. Make sure to use the bolt in the center of the pulley, not the one at the base of the arm.
However, make sure to check the routing on the belt before you do anything else. When I went to get a pulley on my 98 PA Ultra, the guys at INTENSE realized that he belt is the next best thing to impossible to replace, because of the motor-mount placement. It may be a job for a dealer. Not an expensive operation or anything.
I believe that you can replace the supercharger belt by simply removing the spacer for the bottom stud of the passenger motor mount bracket. It'* easiest if you remove the front passenger wheel, then the flexible panel separating the wheel well from the harmonic balancer. Remove the nut on the motor mount stud, then remove the stud (you're supposed to use a star socket, but I used a regular hex socket and it worked fine), and the spacer will slip out, allowing you to change the supercharger belt.
Accessory belt is a different story, though. That one requires the motor to be supported and the polymer mount removed.