When working around your mouth and chin use your tongue to push out you lower lip. This raises area keeps the end of the razor from nicking your face around your mouth. Also you can blow a little air into your cheek to avoid cuts in the sideburn area. Then do as mentioned above and take small exacting passes.

Be sure to pay attention to how you are getting cut. Are you pressing to hard? Making parallel movements to the blade? Shaving with a bad angle? Every cut and patch of razor burn is a lesson, that is how we all learned!

Best of luck and don't give up as the first blood free shave is a great reward!