1997 Pontiac Sunfire GT 2.4 leaky water pump

1997 Pontiac Sunfire GT 2.4 Twin Cam mileage: 137,000. My 97 Sunfire GT (just off warranty) with the 2.4L Twin Cam engine has developed a leaky water pump. What are the proper steps in replacing the pump? The pump is hidden under the exhaust manifold from above and hidden by the transaxle and steering rack underneath. It appears that the exhaust manifold should be removed for best access to the pump. If so, do I need new exhaust gaskets? Many of the gaskets on the car such as the transmission pan are of the reusable type. Besides, of the few parts stores I found that actually can get the pump, none even list the exhaust gaskets. I've done a lot of water pumps in my life, but this application is completely different engineering from what I'm used to.