Step1: Turn off gas and electrical supply to the appliance to ensure safety before starting.
Step2: Close main gas valve and allow remaining gas to dissipate fully.
Step3: Remove pilot assembly cover and access the existing orifice carefully.
Step4: Unscrew old orifice using proper tool, avoiding damage to threads.
Step5: Install new orifice and tighten securely without over-tightening.
Step6: Reassemble pilot components and ensure correct alignment of parts.
Step7: Restore gas, perform leak test with solution, and relight carefully.