Alt is on the bottom below the battery. You need to loosen the left idler wheel under the PS pump, just a couple of turns then on the bracket that PS pump is on you will see a bolt head that will make you go hmmm. Turn that bolt head and you will see the idler pulley start to move, keep going till you can slip the serp belt off of it. Disconnect your battery and then remove the alternator. Then just reverse everything but leave the battery for last. Might want to have THEM test the alt BEFORE you take it home, save you the trouble of doing it twice. I'm a firm believer of when I replace something I put something better in if it's not to outrageous a price difference so you might consider a much larger alternator in the 150+ amp range.
Some useful items to have: Factory service manual, KrikitII belt tension gauge which is sold by napa, ~$12 [that is where I would get the alt from btw], it will allow you to set the correct 170lbs of tension on the USED belt, new belt gets 190lb.
A serptentine belt removal tool, basically a really long ratchet box type wrench with 4 different ends on it, one of those is the correct size for the idler bolt, 15mm IIRC, because you will find out that most wrenches won't fit between the electric fan and the idler pulley. The snap-on, MAC or Matco tool trucks will have them for about $20-40 bucks, napa might even have one.
Thats about all I can think of off hand other than to say if I was going to pull the belt I would put a new one on as well as a new idler wheel, why do it twice. Stuff like that I always buy from the dealer though because it fits.
