Locate the breaker panel in your home and flip the breaker that controls the oven circuit to the "Off" position. Turn off the kitchen gas line by shutting the valve to the "Off" position.
Measure the opening in the wall cutout where you intend to install the oven to ensure the opening matches the width of the oven. If it doesn't, you can cut the opening to size with a saw, such as a jigsaw.
Lift the oven up and place it in the cutout. Don't slide it in yet as you will still need to access the rear of the oven. Have another person hold the oven up at the front.
Insert the gas line into the port at the rear of the oven. Use the wrench to tighten the connector on the gas line.
Plug in the electrical wall wiring into the terminals at the rear of the oven according to the diagram for your particular KitchenAid model.
Slide the oven into the cutout.
Open the oven doors and attach the included mounting brackets to the corners of the outer lip of the oven.
Secure the mounting brackets to the oven and the inside of the cutout with the included screws.