Frogged several times to start- really hung up on the count. When not to count the YOs as part of the “last 7 stitches” in Row1A, but count them as part of the “last 5 stitches” in Row2B.
I had skipped the BRKYOBRK on one end of a Row1A and had to frog back, so I wrote out the stitch counts for the increase rows going forward. Tedious but useful!

I was worried about stretching out the brioche during blocking, so I steam blocked it instead. Worked fine.