If you use the public instance you don’t need to set up or host or install anything. You can selfhost it if you want, but the public instance works just fine.
One person goes to the web page and starts a room. The other can join the same room by knowing the name of the room. (It will generate a link when you create a room to make it easy to send to someone so they can join by just clicking the link.)
Consider giving MiroTalk a try. It has several versions but the P2P version would probably be perfect for your scenario. It’s free, runs in your browser, doesn’t need an account, and doesn’t have time limit shenanigans. I’ve used it in lieu of Discord calls before and don’t have any complaints.
This as well: https://rentry.co/megathread-movies-and-tv#streaming
To clarify, they’re not going after patent trolls afaik, just going to court when they’re targeted by them (instead of forking up a payment to the patent troll company to avoid that). Iirc, the last patent troll they took to court ended up collapsing and isn’t operating anymore.
They didn’t include https so the link doesn’t know what protocol it’s meant to open with
https://rye.astral.sh/