I ended up frogging my first two attempts :( The first was using 2.75mm needles for the largest size and came out far too big, plus the yarn was too dark. My second I started with another colour on 2.5mm needles, but the yarn pooled funny and then I noticed the errata!!
So, I usually knit plain socks on 2.5mm circs with 60sts and a tension of 7.5-8sts depending on yarn. Will I be ok with the smaller size, cos I measured my ankle and it's 8.25"? Even on smaller needles the bigger size was a bit baggy.
And what size needles should I use if my normal tension is the same on 2.5mm needles as the pattern states, I'd hate for my next sock to be so small. *hangs head in shame and embarrassment at lack of skill!!!* Plus I don't have any 2.75mm circs and I seem to have developed an inability to use dpns now.