Look up videos on YouTube. You’re not messing with springs. I think as long as you have clearance, you could diy it. You could leave the overhead there abed just have it disconnected. So if you find you’re stuck, undo that and reconnect the overhead arm.

I would bite the bullet and get a new one. You might even be able to install one that attaches to the side, saves room from the chain/belt system. New one would have integrated wifi and usually battery backup as well.