One of the things the author recommends for aspiring film editors is to watch the way you and other people blink. Apparently, the best actors are the ones who care only how their characters will be portrayed in the film, and editors usually find themselves making cuts whenever a halfway decent actor decides to blink.
Try it out in public. Your eye is the camera. When you blink, you cut the shot.
I think it's a fairly practical way to get in touch with your inner editor.