Take your time to acclimatise your night vision (usually takes around 20 minutes). If you have to use a flashlight so see what is in front of you, then close one eye to have a look. Again the same when reading the map. Get a compass with luminous dial and needle indicators. The amount of light to read a map may require a very low light setting (so as not to ruin your night vision) that most flashlights don't have. You only need 1-2 Lumen. Map read and navigate as normal but knowing how to count and convert the number of paces into a distance can take a little getting used to. Eat plenty of carrots and if you get lost then follow a nocturnal animal as they know where they are going. If you get really snookered then stop, wait for the sun to come up and then practice a 3 point resection to find out where you are.