So, I began at the heel of the sock, migrated down and then back up the foot, and managed:
It doesn't fit! Woe is me! I followed the pattern, but there's no way that it's ever going to go past the heel! Not ever. Either I did it wrong, or someone's cheating at Knitty.
I may have found (one of) the problem(s) with my sock. It turns out that sock yarn is not quite as similar to DK (double knit) as I thought. May have to buy some actual sock yarn for this one. On which note, I've spotted a nice sock kit on ebay...