need pattern help - transferring from double-knitting to knitting in the round

[yarnrainbow]

I was considering trying to make some of these (Ravelry pattern) for stocking stuffers for Christmas but I am having trouble visualizing how to to make the transfer from double-knitting to knitting in the round.

I have never done double-knitting before but I reviewed a couple of videos and I think I understand the concept. DK in this pattern may be a little difficult because, if I understand the pattern correctly, I would be using the same colored yarn from two