Wish my wife would let me grow a beard so that I don't have to shave my neck. It is really hard to do those areas. I am hoping that Alex is right and my technique improves. I do keep getting better and better shaves though so must be doing something right.
As for advice, I found that some Aloe Vera and/or moisturizer helps. Not so much with the shaving itself, but if you notice irritation and soreness it might be a good idea to give those areas of your skin some extra moisture (in addition to after shave etc of course) between shaves. THe scorching heat we have in the uk this week probably isn't doing much for my skin either to be fair.
lol!
I've found that moisturising between as well as after shaves have helped a little with my sensitve neck.
I have a really weird growth patter on my neck, mostly west to east but with a swirl on one side, really tough to shave with the grain so I tend to do my first pass in a diagonal with/cross grain direction, south-west to north-east. Then I do a cross grain pass, south to north and finally I do a cross grain the other way, north to south. Doesn't get me BBS and I still get irritation on my swirl no matter what I do but it's far more comfortable than going against the grain.