Unplug the power cord from the electrical outlet. Turn off the gas supply leading to the Kenmore gas range.
Lift the grates off of the burners and set them aside.
Lift the range top up. Set the prop rod in place to hold the top open.
Pull the thermostat adjustment knob straight up to disconnect it from the thermostat assembly. Set the knob aside.
Remove the bolts holding the thermostat in place with the socket wrench. Lift the thermostat and gasket out of the range cabinet.
Insert the new gasket onto the manifold. Position the new thermostat next to the gasket. Install the bolts that hold the thermostat in place.
Replace the thermostat adjustment knob. Press the knob down until it locks into place.
Set the prop rod into its previous position. Lower the range top onto the cabinet. Replace the grates and plug the range back in.