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I think of the "idea" as something located on the opposite side of a dark room. If you just start walking forward through the room, you'll trip and stumble over furniture because you don't know the layout as well as you thought. But if you take time to illuminate it before walking to the other side, the likelihood that you'll be tripped up by obstacles is diminished somewhat.
I built my character out of clay, and in addition I've built up my confidence in drawing her. I've done this before with other characters and it always helps.