1995 Geo Prizm

The best advice I can give is to use the car repair link in this thread or get a Haynes manual. On some Toyota engines you have to loosen the motor mounts and raise the engine to get the waterpump pulley off, because it is so close to the body.
The pump bolts behind the timing belt to the block and you do not want to contaminate the belt with coolant, so you may want to replace the timing belt while you are at it, or remove it before unbolting the WP. Also mark rotation of the belt.