I can sympathize with that lol, grew up in a very DIY family and that's just how I was raised. Plus we live in a rural area so contractors are expensive and have very little competition.

I've rented a floor sander from Home Depot before, but I'm not sure if it was a true orbital sander or not - wasn't a belt sander though - and it worked very well. I have a few connections, plumbing and electrical. And now that you mention it, maybe even a floor sander. I had forgotten I have a coworker who I think has one he might lend. Thanks!