Location, location, location
Before you leave the house, Doucet suggests making sure you have the right clothing for the weather (some nights get cold) and dressing comfortably.
The camera settings
Aperture: 6.7 (or close)
Shutter speed: (somewhere between) 1/1250 -1/2500 second
Doucet says at those shutter speeds hand-held shots are doable but he highly recommends a tripod. He even suggests a remote shutter release to ensure the elimination of almost all camera shake.