The number of stitches alternates on odd and even rows. If I remember correctly, you end up with 41 stitches at the end of the odd rows and 39 stitches at the end of the even rows. (or vice versa!) And I counted every row for quite a few repeats of the pattern before I could tell when I was off without counting.
I also divided the rows into sections to keep me from losing my place. Every even rows starts and ends with the same 7 or 8 stitches, and the same for the odd rows. Once I got rid of thinking about those, the pattern was easier to see…the middle parts of each row start with descending stitch counts (i.e row 1 starts with K7, rows 2 starts with P6, all the way down to row 8 which starts with no purl stitch) It’s pretty easy to count those stitches on the last row to see where you left off. There’s also a middle stitch on every row that is either a P1 for odd rows or a K1 on the even rows that will help you make sure you are in the right place during a row.
The other tricky thing is the first pattern row - where you …yo, k1, yo, p1, yo, k1, yo…it took me a while to figure out that you have to do some funky wrapping when you YO betwen a K and P stitch. Once I figured that out I was pretty well out of the woods. But it took me about 20 repeats of the pattern before I had it memorized and could work without constantly referring to the pattern!
That was probably more than you actually wanted to know! But I hope it helps!