Not sure about motor mounts, I know I had to do that when I changed my SSEi'* pump, but no idea if it'* different from L67 to L36.
After you remove the PS pump as stated above, just make sure you set it down so it'* not putting any stress on the hoses that are attached to it.
For the water pump itself... I was told it was a dry install gasket kind of thing. Which is probably true for most. But it was my first time doing this, and the pump ended up with a bad leak after I was done. So I had to do it all over again. The second time around I put on some RTV with the gasket, and it hasn't leaked since. Granted, the leaking was probably just due to me being a n00b but still, the RTV definitely didn't hurt. Especially if you end up having to remove the motor mount, you WON'T want to have to do it again
Also make sure you have ALL the torque specs for this handy.