Honestly I will have knit three socks in the end.
Twice round on the heel flap. Got to the turning and realized I'd done a slip knit slip across the flap, whereas the first was knit slip knit. Heel turning didn't look the same. I knew it was subtle and I knew it was under the heel. Still I ripped back.
Got through the second gusset and realized it was short. The heel flap was short, I'd picked up fewer stitches. It was more prononced than the aforementioned sins of the heel. Ripped back.
Almost done with the gusset. I hope to see my way cleanly through to the end. The intended wearer has a smaller foot than I, so that should go quickly. And I have already done the third major do and redo, way back at the multiple starts on the first sock.
My, but it's a good thing I am trying to focus on just one thing. I'd have a lot more trouble if I were juggling multiple knitting at the moment.