I fished the first sleeve yesterday. It used up a full 50g ball of wool so I'm happy I chose to do it before finishing the body. I kept the extra 7 stitches in because I have wide arms, and I'm pleased to say they fit perfectly. So far, unblocked.
I'm not a big fan of top down knitting, it is so awkward knitting the sleeves. I much prefer bottom up knitting, even if the first few rows after adding the sleeves are a little fiddley, I still enjoy the process more.
But on we go, I've picked up the stitches and I'll begin the second sleeve.