Shape shoulders and back neck
I've knitted the back of the jumper and now have to shape shoulders and back neck. I have to cast off 2 stitches and knit until there are 18 stitches on the right needle and turn, leaving remaining 51 stitches on a holder. Work each side of neck separately.
Dec 1 stitch at neck edge of next 6 rows and at same time cast off 3 stitches at beginning of 2nd and following 2 alt rows, work 1 row and cast off remaining 3 stitches. With RS facing slip centre 31 stitches on to a holder rejoin yarn and knit to end, complete to match first side reversing shapings. I am confused with the reversing shapings, any help greatly appreciated.