At times when I knit I tend to think to much and find myself stuck. My question is if it says, “Decrease 1st each end of needle on next and following 7 alternate rows” just what does that mean. I know how to dec 1st at each end, but the following 7 alt rows, I’m not sure. It could mean, dec 1st each end on not 1 but second row 7 times or dec 1st each end on every 7th row. See what I mean, I over think it. HELP!!! Someone define this for me so I can finish this sweater vest, please!