I came across this NanoWriMo pep talk by Neil Gaiman. I loved his analogy of writing as building a dry stone wall.
“A dry-stone wall is a lovely thing when you see it bordering a field in the middle of nowhere but becomes more impressive when you realise that it was built without mortar, that the builder needed to choose each interlocking stone and fit it in. Writing is like building a wall. It's a continual search for the word that will fit in the text, in your mind, on the page. Plot and character and metaphor and style, all these become secondary to the words. The wall-builder erects her wall one rock at a time until she reaches the far end of the field. If she doesn't build it it won't be there. So she looks down at her pile of rocks, picks the one that looks like it will best suit her purpose, and puts it in.
The search for the word gets no easier but nobody else is going to write your novel for you.”