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Your friend is partially correct in regard to the thermostat. You do not have to change the thermostat at the same time you do the water pump. The labor to get to either is redundant so it make sense to do both at the same time.
This is not a tough job if you can get under your car. You drain coolant. you remove the serpentine belt, hoses to the pump and then the water pump bolts. Clean the surfaces replace the pump, hoses belt and refill. Lots of good info on various sites on this job.
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