PICK A SPOT
When shooting at night, it is best to research a spot with minimal light prior to shooting. It will just make the process easier. I chose the Upper Geyser Basin where Old Faithful is located because it was a familiar area and wasn't pitch black (I'm a little scared of the dark). Going with a friend that has experience in shooting at night will make you feel more comfortable as well.
Ensure that all camera gear (i.e. tripod) is with you. If you have a mirrorless camera like me, you know that the battery life is horrible. Charge those batteries and have back ups.
CAFFEINE & SNACKS
You'll get tired, sleepy and even cranky. I shot the milky way and northern lights at around 2am, then sunrise was at 5am. I found that snacks kept me awake. So, load up on that caffeine and snacks.
It is freezing at night; especially if you decide to get some snooze in the car while waiting for sunrise. Layers is your best friend! A long scarf helps your face warm up and gloves definitely helps when you are shooting. Bring blankets for extra warmth too!
TRIAL & ERROR
A perfect shot is not done in one take. It's a lot of trial and error. Patience is also the key. Once you get the hang of the settings on your camera, you can play around and even use a flashlight to "paint" the foreground.