How do you find and replace the thermostat in a 1988 Nissan Sentra and is it easy?

On almost all cars, the thermostat is located in the head of the motot where the top radiator hose is connected. Usually 2 bolts or nuts, remove these, and remove hose/housing. Some cars require you to remove hose first, some you can leave it attached. Clearance, flesability of hose. Most have a paper gasket which must be cleaned off and a new one used. Some have a rubber ring that goes around the thermostat. Large half of the thero. goes toward the motor, some are out of round and must be placed to fit.