Here are the tools. I use the #2, #3 and #4 clipper guides when I cut Paul's hair:
First I have him get his hair wet and comb it back. This makes it easier to cut.
I begin with the #2 and cut around the bottom and just above his ears.
Here's another picture that shows how much I cut off with the first length:
Next I switch in the #3 guide and cut around his head one more time leaving the longest hair on the top.
This (the picture above) kind of reminds me of the hairstyles when I was in junior high...
Then I take the #4 guide and go over the top. This usually takes the longest and I have to go over it again and again to make sure there aren't any stray hairs.
After that I take the little clipper and "clean up the back of his neck, above his ears and his sideburns.