Step1: Turn off oven gas/electric supply and disconnect main power for safety.
Step2: Remove access panel and carefully take out old thermostat assembly.
Step3: Note bulb routing path and capillary tube position before removal.
Step4: Install new thermostat, secure mounting bracket and bulb in oven cavity.
Step5: Reconnect wiring terminals exactly as labeled on original connections.
Step6: Restore power, set temperature, and test thermostat response.
Step7: Inspect operation, check for overheating or irregular cycling for safety.