Originally Posted by Mike
Does it really matter?
If you can't tell where you started it probably doesn't and you can call anywhere the start of a row.
If you can tell but not exactly it probably doesn't matter exactly. Just kind of put that spot generally to the back.
I don't count rows on plain socks or hats. I knit to length and then divide for decreases or sock parts.
I can honestly say, after about your third or fourth pair of socks, it doesn't matter about that center stitch. I can now divide up my stitches as needed because I'm very familiar with where I want the instep to be... of course, I'm doing self-striping or plain white socks so it doesn't really matter, but then I start cabled pattern socks, you can bet your bippy it will matter and I will have to be very careful about where that "center stitch" is.
Since this is for a class, I would imagine that the instructor has a reason for wanting the students to always be aware of where the center stitch is for when they begin to divide the stitches for the heel flap. It's a crucial step in learning socks, mittens and gloves.