Toyota Repair: 1990 toyota celica Gt water pump, toyota celica gt, timing belt replacement

Question
how do you change the water pump?  What is a reasonable cost for a mechanic to change the water pump and timing belt?

Answer
The water pump is driven by the timing belt and it's common for both of them to need replacement, since the timing belt is being replaced the labor to replace the pump is much less, most toyota dealers have a timing belt replacement special going on all the time, a reasonable figure for parts and labor is around $500.