Figured this was too easy to give you a tutorial, and took about 5 minutes. See the attached images. The pulley is easy enough to remove. Remove the belt by loosing the tentioner. Remove the four bolts by "breaking" them loose using a screwdriver against two of the other bolts. Remove the four bolts.
Refer to the second image. There are bolts all around the pump assembly. Remove them, remove the top most one last (so it is the last bolt supporting the pump in the event it is not sealed by the gasket well). There are 5 of them. Once the bolts are removed, gently pry between the tabs on the edge of the pump and the timing cover (in the event the gasket was sealed well). Remove all traces of the gasket material. Installation is the reverse of the above. I would advise simply getting an account on alldatadiy.com for the detailed procedures and torque specs. $25 is pretty cheap, and the ability to do yourself and learn is always a plus. Saves on those crazy $70/hr labor rates too if you are cheap
Note in the second picture, the screwdriver tip is pointing to one of two weep holes on the NAPA pump. (this is a fairly new pump) When the pump is worn, it is designed to start leaking. Again, this mechanism is basically the pump saying "Change me now! Circulation is poor, overheating is eminant! Danger! Danger! Click-CLick-c l i c k - Boom!".
Edit: Note the pump pulley on the top of the second picture. That is the "inside" of the pulley
