One mostly done
Here is one slipper mostly done (still needs the contrast edging and strap...I'm thinking black at the moment, but haven't decided for sure):
I'm using Cascade Yarns Quatro 100% Peruvian highland wool, color number 9434, and US 7 bamboo double point needles
It didn't take terribly long to learn the cast on, and I even was able to follow the pattern directions. On the knit-along site there are several sets of toe-up cast on instructions, and several participants have had difficulty with it, so I thought I was done for. Turns out, that's possibly the part I can do the best.
I also had every intention of using the medium size, but I think I might have switched between the medium and small. At any rate, the slipper is quite a bit too big. It's wool, so I might be able to felt it down a little, but I am going to try to make the second one according to the small pattern and see how it goes. Worst comes to worst, all I'll have to do is get some more yarn and make a fourth of one size or the other.
I also really had difficulty with the heel instructions. After knitting the final row of the bottom, the instructions read, "dont turn; cast on 14 stitches and join." I assumed that join meant "put everything back on two dpns and continue like the toe," but it didn't really make a lot of sense the way I did it. I don't like the way the heel came out, and I'm pretty sure I didn't do it right (just a note: it really looks better in this scan than in real life...).
But, there's nothing like doing it again for practice! :-)