As for what Scotto said, I find that on my neck the lower hairs grow in a S-N direction whereas the top half of my neck grows in a N-S direction. Therefore, on my first pass for my neck, I go N-S for the top half and then S-N on the bottom half. This has worked well for me. And of course when I do my against the grain pass, I just go in reverse. Best of luck. Let us know how things turn out.
"Better to keep your mouth closed and appear a fool, then to open it and remove all doubt." --Mark Twain