You want to harvest your plant a few days after your final watering, that way there is less water in the plant. Harvest the plant right before your "lights-on" so the plant is in the dark (light degrades THC). I like to cut off individual colas, trim off ALL leaves and leave with small stem. I basically cut the whole plant down into individual nugs or colas. I do all this to allow as little chlorophyll as possible to be retained inside the weed, which gives it that "wet hay" smell.
You hang up all the cola's and large nugs by wire in a cool room with highish humidity. The small popcorn buds can be placed on a screen and hung as well. Dry for 2-5 days or however long it takes for the outsides to feel crispy and the stem bendable but not breakable. Then you place the buds in curing jars. Open a few times a day to let the moisture out. Always shake the containers to move the buds around. You do not want any mold to form! After a week, just open the jars as necessary to relieve moisture. If you dry too much, you can place a wet herb leaf in the jar or a citrus or melon rine.