how do i replace the water pump?

It is extremely important to have a repair manual for this. You need to remove the timing belt to replace the pump. Before you remove the belt, you have to set the crank and cam marks to a given position and make sure they won't move. You also have to compress the hydraulic belt tensioner. There are a big risk for engine damage if you are not completely sure what you are doing. I'd suggest to take the car to a shop and let them do it, the water pump / timing belt replacement is a lot cheaper then a valve job on this car. If you think you are still capable to do so, here you can find good repair manuals, but you need to follow the instructions right to the dot. : http://www.eautorepair.net/Marketing/default.asp?VID=125669&Count=Y Zee