Last I checked, there was a major caveat to this - it mucks with your PATH in intrusive ways. So it's not "just try it", it's "switch to a frankenstein system and don't turn back"
- Normally, just deleting /nix gets you 95% of the way back to normal.
- If you want a bulletproof removal, the determinate systems Nix installer saves a file with a list of all the operations it made during installation so that it can be cleanly removed.
- If you want to stop home-manager from hooking into your shell without completely removing Nix, there's a separate uninstall command for that.