I used light blue as my MC, gray for CC1, and orange for CC2. My shawl is a little smaller than the pattern instructs, as I was only able to do 6 repeats of Section 3 before running out of the MC.
I did a YO between the 1st and 2nd stitch of each row as many other knitters have suggested. I also used removable stitch markers 5 stitches in from each end. This helped me keep up with when it was time to do a row with 4 increases instead of 2. Once I had increased enough to have the stitch markers end up being 10 stitches from the end, I knew it was time to move them again and do another row with double the increases. And for anyone else who overthinks things and confuses themselves like I do, on Section 3 when you are doing short rows, each successive short row takes up a total of 4 more stitches than the one before.
This was a pleasure to knit, as it was a relaxing and mindful knit (not mindless). I already have yarn picked out for another one (or two).