Water pump R&R

I've got a friend that has a 2004 Envoy with the 5.3L V-8. Has anyone ever done a water pump R&R on this vehicle? Are there any special tools that are required? I've done a bunch of old school chevy V-8's but I can see by the design of this water pump that it is not the same. Any help would be greatly appreciated.

Nick

Try autozone.com, repair guides, register and go to engine cooling.