Well, I'm a granny though not the traditional one...
Really, just pick up the sts around the neckline, knit straight up about 5" or so, then decrease similar to how you would for a hat. Knit x sts, dec, knit x, dec, across the row, maybe every 4 rows. I think you want a point in the back, you could put a couple of the decs close to each other in the center of the row. Just experiment (maybe on leftover yarn) until you get the look you want.
sue- knitting heretic