Step One. Get a roommate.
Step Two. Become nocturnal.
Step Three. Write at night, in the dark so as to not wake your roommate and so that you are unable to see your keyboard. Use trial and error, writing every night until you memorize the keys.
You should now be able to type super fast without ever having to hesitate to look down at the keys to make sure you are hitting the correct letters. The down side of this is that you can no longer use your inability to type as an excuse for not yet completing your novel.
This is how I accomplished it, though not on purpose.
And no, I haven't finished my novel yet...