Shaping cap of sleeve

The directions say to dec 1 stitch each side of every row (stockinette stitch) for 10 rows. Please, what is the best way to do this?

You’ll probably want to do SSK and K2T, depending on how you want the stitches to slant. You can look here is you need directions
http://www.knittinghelp.com/knitting/basic_techniques/decrease.php