How do I change a Thermostat on a 1991 Honda Accord?

I was also wondering if I need some anti-freeze to refill the cooling system when I'm done.How do I change a Thermostat on a 1991 Honda Accord?
If you don't even know that, bring your 1991 Honda to a reputable garageHow do I change a Thermostat on a 1991 Honda Accord?
you follow the instructions written in a auto mechanics book