Ingrid, you're so sweet to help me, but I'm still confused. :?
I actually posted the 1st part of the pattern after the 2nd part. So it actually reads:
[i]P tog first st and the loop, P1, P2tog tbl, P to last 4 sts, P2 tog, P1, pick up loop lying between needles and place loop on right needle. (this loop does not count as a st), sl last st purlwise.
K tog tbl first st and the loop, K1, K2tog, K to last 4 sts, K2tog tbl, K1, pick up loop lying between needles and place loop on right needle. (this loop does not count as a st), sl last st knitwise
Last 2 rows form slip st edging and set armhole decreases.
Keeping sts correct as set, dec 1 st at each end of next and foll 3 alt rows. [/i]
If I just keep doing these 2 rows, how do I only decrease on every 3 alt row? Do I need to decrease and extra stitch ( by k2 tog or somethig?) Am I just making this harder than it is and just follow the rows as written? Hope it turns out right?