Like vristang said be careful when tightening up the waterpump bolts. Use plenty of antisieze on them when you put them back in. If you ever have to change the water pump again you will thank yourself. Getting replacement bolts can be a real pain in the ass.
It is pretty straightforward. I usually just unbolt the accessories and lay them off to the side, i.e. ps pump, alt and a/c compressor. Be careful when taking the water pump bolts out as sometimes they have the tendency to snap off. Should take a few hours if you haven't ever done it before.The most time consuming part is getting all of the crap out of the way so you can actually unbolt the pump.