I am a technophile, so there is no such thing as a first draft. The first draft plunges on, and about a quarter of the way through it I realise I'm doing things wrong, so I start rewriting it. What you call the first draft becomes rather like a caterpillar; it is progressing fairly slowly, but there is movement up and down its whole length, the whole story is being changed. I call this draft zero, telling myself how the story is supposed to go.