How consistent I was from that 9-12 slot went in waves. For a couple weeks in a row I'd be at it every night, and then I'd have a couple weeks where I wasn't as productive. The summer I went through a productivity lull for some reason.
I hope you keep it going and good luck with it!
How much time have you spent doing tutorials / projects vs. pair programming? 50/50?
No pair programming, but that sounds like that would be a huge help.
The pre-existing skills did help a bit, but HTML/CSS are not that hard to pick up. Add maybe a month to get up to speed with there. Twitter bootstrap is a good help in that area.
Good luck and keep up the great work!