I thought I knew all the tricks too, until some really tight tire/rim combinations kicked my butt.
I was afraid with some of these I’d never be able to fix a puncture on the road.
Here’s something I’ve learned: after being pressurized and ridden a little, they loosen up. With some tires, although the first time going on can be super tough, subsequent mount/dismounting is MUCH easier. They stretch and soften just a little. Edit: just noticed I restated the same thing as the previous comment. Glad to see others validate my findings.
To answer your question, no, I would not recommend sanding or filing your rims.