nix-env has been easier to use for a new use compared to having a configuration.nix, using home-manager etc, but once you start using any of the latter then jus

nix-env has been easier to use for a new use compared to having a configuration.nix, using home-manager etc, but once you start using any of the latter then just remove everything installed with nix-env (and use nix-shell for one-offs).