I once heard of a writer (Dick Francis? Frederick Forsyth? Don't remember) who composes the entire novel he's working on in his head until it is word perfect. The actual process of transferring the words onto paper is just a chore that has to be endured.
This is not me. As someone who (with very limited experience) tends to write their way into characters and the story, I'm finding the temptation to go back and play around with what I've written so far is soooooo strong. I'm just about holding out, but am under no illusion that it'll last.
Do you plan? Do you wing it? And how do you resist the urge to edit?