You can pick any nightmare you want, to start with, as long as you remember enough of it. Then you write everything down. [She remembers how difficult that was. Dreams were always the aberration; the one thing she couldn't remember with complete clarity. It stopped being so frustrating, eventually.]

Then you figure out how to change it. [She considers, for a moment. An example would help, probably.] Say you're about to get shot. But this time, the bullet misses, and you punch him in the face.

After that - you just focus on that alternate version, for a few minutes each day.