Engine is overheating. within 15 minutes of operation. on 1997 Lexus ES300

My Lexus is overheating within 15 minutes of running the engine. I think the water pump is not working and needs to
be replaced. The car has over 250,000 miles on it. Is the
water pump easy to replace? Where can I get a set of instructions to do this job myself?

Asked by for the 1997 Lexus ES300
If it is overheating its the thermostat. or you are low on coolant or the radiator is plugged with bugs or dirt.
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MY LEXUS IS OVER HEATING 15 MINUTES AFTER DRIVING