This works for me: 1st pass - lather, straight down strokes, stretching skin on my neck. For the second pass, I use shaving oil (King of Shaves) + lather. I do two directions on my chin (left to right and right to left - jaw bone to jaw bone) with a LOT of stretching (insufficient stretching => 100% nicks), short scything strokes. I finish the area under my chin with a few short straight up strokes; raising my head usually stretches the skin well enough for that.