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 `/etc/nixos/configuration.nix` again to enable ssh and run `nixos-rebuild switch`

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