Okay, how much time, energy, frustration are you willing to put into this repair.
Having done mine relatively recently, I can assure you that it is not an endeavor to be undertaken lightly. I assume you have, or have access to, a good set of tools, a garage with a lift (or at least a decent jack and a good pair of jack stands)?
If you are still in for trying it I will give you my standard three step process:
1. buy new alternator
2. disassemble car
3. reassemble car around new alternator
But seriously, HERE
is a link to doing a 2.8 timing belt. Most of the procedure is the same as far as getting in to the alternator.
good luck, let us know how it goes