I wouldn't touch the eye caps. You can seriously injure your snake's eyes permanently if you do. If you are insisting on getting the shed off the head (which, in my opinion, should just be left alone until the snake sheds next), you can take a Q-tip and dip it in some olive oil. Have one person hold the head, the next work off the skin.
But like I said, if you get the majority of the body off, then leave the head until the next shed. It may not look as pretty, but it's better for your snake and you won't risk injuring it or stressing it out if you just leave it alone.