Rough installation instructions

NixOS config

Boot NixOS installer and follow instructions up to but excluding nixos-generate-config
mkdir -p /mnt/etc/nixos
git clone https://github.com/strangeglyph/nix-home /mnt/etc/nixos/nixos.d
bash /mnt/etc/nixos/nixos.d/setup-config.sh -r /mnt -h <hostname>
Edit /mnt/etc/nixos/nixos.d/config/<hostname>.nix to your liking, if it doesn't exist yet. See e.g. aeolus.nix or euclid.nix. In particular, set or update system.stateVersion.
nixos-install
nixos-enter, passwd <normal user>
Reboot and veryify installation

Log in as the user you want to set up HomeManager for
bash /etc/nixos/nixos.d/setup-home
Edit ~/nix-home/home/<hostname>/default.nix and ~/nix-home/home/<hostname>/<user>.nix, if they don't exist. In particular, set or update home.stateVersion in <user>.nix.
nix-channel --add https://github.com/nix-community/home-manager/archive/release-<stateVersion>.tar.gz home-manager
nix-channel --update
reboot
nix-shell '<home-manager>' -A install
Done! (May need to log in again)