Follow steps at https://nixos.org/manual/nixos/stable/#sec-installation-manual-summary

Note: run `lsblk` to determine correct device to install to.

Set the hostname when editing `/mnt/etc/nixos/configuration.nix` before the installation:
`networking.hostName = "jaglan-beta-mNN";`

Once `nixos-install` is complete and the root password is set and saved edit the `(/mnt)/etc/nixos/configuration.nix` again to enable ssh and run `nixos-rebuild switch`

```
services.openssh.enable = true;
services.openssh.settings.PermitRootLogin = "yes";
```

Upgrade the OS
`nix-channel --list`
`nix-channel --add https://channels.nixos.org/nixos-25.05 nixos`
`nix-channel --list`
`nixos-rebuild switch --upgrade`