I did mine myself as well. Bought it from DDM garage doors and can’t say enough how great that company is. To get a kit for your door, they have you fill out a sheet with dimensions for them. With that info, they put a kit together for your application. They even tell you how winds are needed for your kit to balance the door. I had a few questions and was able to quickly get answers from them. Turned out great. Winding and unwinding garage door torsion springs is damn dangerous. Watch all their videos. They helped a ton.