1: Start writing. An idea is not necessary at this stage.
2: Keep writing. Pay no attention to mundane matters such as plot, character, setting, structure, or story. Just keep writing words until you have around half a million of them.
3: Now take those half a million words and throw. them. away.
4: Stare into the void. Woah. Stare into your computer instead. Rescue an idea you find limping around in the aftermath of the word-apocalypse. (This idea has survived purely by virtue of its fiendish ambition. Its most impressive quality is its refusal to die, despite having seemingly nothing to live for.)
5: Write until you figure out some kind of structure that can cage this ugly, tenacious bastard of an idea. Fail horribly, shamefully, and repeatedly. The writing will be enriched and nourished by your desperate tears.
6: Completely lose perspective. Employ diversionary tactics.
7: Keep writing the bits you’ve already written. It is important not to give up on the dream of writing something that makes actual sense.
8: Give up. Any ending will do. Who cares.
9: Finish it out of sheer bloody-mindedness.
10: Send it to whichever person in your life you consider to be the most psychologically stable.
11: MOVE ON.