I used the guides on the forum to get my game setup for SAM so I have FNIS installed, though I don't completely know what it does tbh. But in my efforts to mod Skyrim into a game I would actually enjoy playing (so as to have an excuse to play with the SAM bodies) I've run into a few mods I would like to install.
Combat Gameplay Overhaul
However, these mods, which were developed by the same person, are apparently NOT compatible with FNIS and if I'm understanding the page for CGO correctly they instead need a different behavior handler (Nemesis).
So I guess what I'm trying to ask is "what does FNIS actually do for us SAM users and if I can replace it with Nemesis, how would I go about doing it without completely breaking my game?"