How do I change it...Just bought a new one from Autozone...looks HUGE and a bit more then a water pump.

 

i just did mine last week. Its not bad.
drain radiator
pull stuff off front of engine (air box, maf, belts, hoses...)
I replaced the hoses at the same time
6 bolts hold it to the block (mine came off easy)
clean the front where the gaskets were (dont scratch it up)
move or replace thermostat to new water pump
install new pump and gaskets
put everything back together