I posted on this but it got lost when I reimported the database. Anyway, take a razor like a Sensor and hold it horizontally with your finger and thumb up by the head of it. Put it up to your neck (blade pointing down) and draw it up under your hairline. Then lightly shave downward. (Do all this in the shower with your neck wet). Repeat until all neck hair is gone. Check in the mirror for missed spots. If you want to trim the hairline, use a pair of scissors made for bandages that have a blunt tip and a sharp tip. The main problem is getting your head to figure out how to make your hand hold the scissors right when you're looking in two mirrors to see the back of your head. Go very slowly trimming across the bottom of the back. It's not that hard once you get the hang of it. I cut all my own hair and it usually looks better than any stylist ever did it.