OK - it's cheap, it's nasty, the lighting's bad and the sound is out of sync, but for better or worse here's a video of me shaving my head.
Head Shave
It's not a tutorial, just a fairly accurate representation of my daily head shave (I keep looking at the camera to make sure I'm still in the shot...:shrug:).
Hopefully it's good enough to give you the general idea.
James.