install FreeBSD from the latest DVD1.iso file available on freebsd.org
upgrade pkg, install sudo, and install git.
login as whomever
run the following:
sudo git clone https://github.com/PokerPlayer2000/FreeBSD_Install_Gnome
cd freebsd_install_gnome
chmod +x main.sh
sudo ./main.sh
Goodluck. Hopefully this works for you.