First of all, you can disconnect the negative battery terminal and drain the cooling system. Remove drivebelts, timing belt, and accessory brackets from the water pump. Detach the water pump from the engine, and clean bolt threads and engine holes. Compare new and old pumps. Clean engine and new pump surfaces with thinner or acetone. Apply RTV sealant to the new pump's O-ring groove and set a new O-ring. Attach the pump to the engine, thread bolts finger tight, and tighten to torque. Reinstall removed parts, refill and bleed the cooling system, and check for leaks.