If you are a DIY enthusiast, you can start by gathering the tools. You will require a hammer drill, jigsaw, screwdriver, tape, sandpaper, and safety glasses. Depending on the size of the products and placement, you need to mark the points first. Then, start drilling by taking safety precautions. Once done, it is time to use the jigsaw tool and make the opening for the cat door. Now, fix the door and you are done with the mounting. Well, the steps are similar to door mounting, but the wall consumes more time in making the opening.