1. knowledge. Ohm's law. General DC electrical theory. How the
mod you are putting this on works and how all of the parts go together. Battery types and safety. Wicking materials and properties. Resistance wire types and properties.
Building is not difficult if prepared, but the price of failure can be severe. I'll let Baditude post the pictures.
2. Ohm reader, a digital multi meter is recommended as well.
3. A
rda
4. Kanthal A1 wire in diameter of your choice. You will know what you want when #1 is sufficiently explored.
4. Tools - snips, pliers, tweezers, a mandrel (rod of known diameter to build on), small screwdrivers, I also always have a toothpick or two in my kit.
5. Wicking - everyone has their preference, see #1.