Woohoo! I've finished my almost-final draft of my w.i.p.! So, to use a metaphor to death: my first draft was the foundation, the walls and roof of my novel, this draft was finishing the outside and inside: painting, laying down tile and carpet, bathroom fixtures in, etc. And the next draft is moving in (the final tweaking draft).
Okay, that's goofy. But I've found that thinking of my w.i.p. this way helps me DETACH (a little) from my work. Which, in editing is extremely useful. Any subjectivity is sooo helpful. And difficult to achieve. I think of my novel as a structure where in the first draft, I can move the foundation, have more rooms or fewer rooms, and so on. In the second draft, I can change the paint color, the fixtures, the tile. The third and final draft: the house is in place, it just needs to become a home.
Secret: Whatever your creative endeavor, thinking of it in metaphorical terms often is useful for gaining a touch of subjectivity. Another example: a friend of mine is an artist, a painter, who thinks of her canvas as a film--the different scenes are the paint she lays down as she progresses.