You're going to work the shoulders and neckline shaping separately. So k16 turn and work only on those stitches. Right after you turn, dec a stitch then finish the row. Turn and work across the sts till 2 before you turned before and dec. Turn and dec and finish that row. All the decs are done, and you have 13 sts now, so you work 4 rows on them. That will be a RS row, WS row, RS row, WS row and you do whatever it says next on the next row which is a RS row.
sue- knitting heretic