You're not really holding it when you mark it. You're leaving that little piece of yarn or marker in the stitch as a reference for later. At some point they'll refer to the marked stitch as a place to seam, pick up stitches, whatever.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry