Approach the page with trepidation. Writing is a miracle of creation ex nihilo; to begin to write is to take a step off a precipice. There may be nothing there to stop your fall.
Procrastinate until you are too tired not to write, until it is easier to write than to defer writing.
Wait until the last minute; let panic be your engine.
Edit as little as possible. What is written is written, fallen from the womb ready to breathe and scream and fend for itself; tinker too much and you will deal only death.
Move to a new place regularly; after a day or two of increased productivity this place too will be steeped in struggle, despair, and suffering. Writing will hang heavy in the air whenever you return. It will weigh you down.
The page is a wall; throw yourself against it until you are bruised and defeated.
Do not give up on your desire.