1.Install steam
2.Change the setting so proton is used on all games
3.Download/install game
4.Play
I guess there might be difficulty setting up lutris and drivers but that's something a search on your search engine of choice can fix, or even just asking here.
Odd. Things continue to improve, maybe it has gotten better? The majority of issues/glitches ive experienced on Linux while gaming have been glitches present on Windows too. Out of my library, there are no games that are outright unplayable on Linux, and 1 game that I need to host lobbies to play multiplayer. I tend to get better performance on Linux as well.
I recommend for anyone considering Linux for gaming, look at ProtonDB to see if your fav games are playable or require workarounds. I find it rare that I actually need to look anything up.