How do you replace a thermostat on a 1995 silverado Should you replace the housing when you do this also on a truck this old?

How do you replace a thermostat on a 1995 silverado Should you replace the housing when you do this also on a truck this old?
Take the two or three bolt out of the housing. Make sure you have a tub under the motor to catch the coolant. Break the seal on the housing. Remove the old t-stat. be sure to clean the surface on the housing as well as the surface on the engine head. Put the new t-stat in the dead. (be sure it in the right way) Put gasket sealer on the new gasket and place on the head. Place the housing on the gasket being carfule to keep the gasket in place. Replace the bolts. Be sure to tighten them evenly or you will break the housing. Make sure bolts are snug. Relace coolant. Start engine and check for any leaks.