Next row (RS) *K to within 2 sts of next marker, k2tog tbl (through the back loop), sl marker, k2tog; rep from * across all markers, k to end (8 sts decreased).
Next row (WS) Purl. Rep last 2 rows 14 times in all;
Does this mean that it will be 28 rows in total?
Each group of 'held' stitches should be on a separate holder or piece of yarn, rather than counted as a total of held stitches.
When you pick up stitches for the neck, you'll only be using the stitches that were held from the back of the neck. (or the front and back if it's a pullover) So count how many stitches are live and then pick up enough stitches to reach 49, dividing them evenly on each side of the neck. You won't need to pick up one stitch for each stitch of the sweater, you'll skip some here and there to reach the correct number.