I'm knitting this on size 5 needles (if I were working on this at an event I wouldn't be using a circular needle) and using Brown Sheep's Top of the Lamb sport weight. It is a single ply yarn which will felt if not carefully cleaned (I used what yarn I had). So far I like the way it's turning out. The pattern can be found here. If your uncomfortably with the YO (yarn over) as the beginning stitch, you can cast on an extra two stitches and start with a K1 (knit one) and ending with a K1.
Let me know if you make this scarf. I'd love to see your pictures. If your on Ravelry, I'm MorganAside.