Check out this excellent short row heel tutorial.
Though I prefer the fit (so far) of top down, proper heel flap socks, I much prefer to knit toe up. Something about the logic of knitting in the same direction the sock goes on the foot, that I can shape as I go, trying it on, and I’ll never run out of yarn at a crucial moment. Unfortunately, I have never had the foggiest idea how to follow the instructions in Wendy’s Generic Toe Up Sock Pattern.
Now I feel confident to start again on my Wildfoote socks with the yarn I got from the excellent Yarns Online.
Disco Knitter 