I’ve been using NixOS for a year now, and I did use LLMs to set up a large part of my configuration: It’s absolute amazing being able to share 1 configuration between multiple machines.

I also added a Justfile to hold a bunch of common commands, so I can never forget them :D

Just start out by throwing your hardware-configuration.nix and configuration.nix (from /etc/nix/configuration, IIRC) into a repo, and sudo nixos-rebuild switch as starting command (in that repo).

Also yes, each host will need its own hardware-configuration, but they can share a configuration.nix (to some extent), but just start by adding a list of programs from https://search.nixos.org/packages, oh and @vimjoyer IS the documentation.