I would suggest imagining your scenes first. Choose a scene you think might be interesting, from anywhere in your novel, and then picture it in your mind. Let it play out as if you're watching a movie. See where it goes, what the characters say, what exciting things happen. Then, once you've "watched" it a few times, sit down and describe it by writing out what happened. If you get stuck, close your eyes and imagine the scene again.
I often begin my novels in this fashion, and it always works wonders in jump-starting my writing mojo.
I often begin my novels in this fashion, and it always works wonders in jump-starting my writing mojo.