With Openrc it is as easy as removing xdm from the default runlevel. With systemd I was not sure how to do it, I tried removing gdm;
systemctl disable gdm
So what did work was to edit the new entry created in grub2.
If you have the menu hidden you will need to press esc then e, I only needed to press e. Look for the line starting with "linux", a few rows down and add a space then "S", without the quotes! ,then press F-10 to boot into single user mode. :)
That it ...