6. And again: Grounding and bonding skills
Attribution: By C. Clark [Public domain], via Wikimedia Commons
To reiterate (but mainly just as an excuse to include another gnarly lightning photo), in the coming zombie apocalypse, there's going to be a lot of cloud-to-ground zapping-and-blowing up action. All grounding and bonding expertise that can be brought to bear is going to be of paramount utility.