DIY. The delivery to Milwaukee took two days. The project was very easy and took about 1hr. The only tools required were a screw driver (electric) and a pliers. Just make sure your irganized with the screws so you don't lose any or mix up which ones go back in which holes. There's about 20 total screws. This $50 part saved me from having to buy my wife a $1000+ oven.