I had someone ask a Fair Isle question, and I wanted to share this bit of magic. When I’m doing two-color Fair Isle, I always hold one color in each hand. Using this video’s method of trapping the floats means that you don’t wind up with giant spaghetti strands on the back of your knitting.
And remember: knit Fair Isle loosely. Those floats need to be nice and un-tensioned across the back of your piece or else the whole thing will pucker in.