Go Lou, size 12 and in the 9s you are a star.
Now MSc got 1000 words done, excellent more will just flow. Its the getting started thats a problem. Yep it will be stressful but not for ever, you can and will do this. Make sure you set a target for every day and aim for that. Build on it every day. I'm rooting for you its not easy but you'll be fine.
Good luck
M