Boot from NixOS USB, then:
Find your target disk with lsblk. Available hosts are in modules/hosts/.
sudo nix --extra-experimental-features "nix-command flakes" run github:nix-community/disko/latest#disko-install -- --write-efi-boot-entries --flake github:linusammon/nixos-config#your-host --disk main /dev/your-diskReboot when done.
Important
Default passwords for ALL users (including root) are changeme.
Log in and change them immediately after first boot using passwd.