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.)
I don’t wear mine often, but I find that somehow the corners always get smudges on them no matter how careful I am to not touch the lenses. Keep a microfiber cloth around to clean them.
I use EyeBuyDirect for my glasses and don’t have any complaints. They come in a box with a microfiber bundle to carry them glasses in and wipe them off with. Obviously since it’s online you’ll have to be careful about getting a pair that fits correctly, but if you get a temporary or cheap pair in real life that you know the measurements of you can find a pair with similar stats.