In all fairness to the OP, the guide is specifically for Kali and the standard Kali install only has root...
I didn't actually know `apt-get autoremove` could be used like that -- I thought it was just used to clear up orphans after using `apt-get remove <name of package>` -- so thanks for that.
FYI, using `aptitude remove <name of package>` will auto-autoremove and save you typing 2 extra characters
Also, Kali isn't really intended for newbies and running the X server as root in a full hard drive install (rather than a live USB stick) is probably a really bad idea...