One other thing to add: The author recommends, if you can, moving to the part of the world you want to work and pound the pavements to find a job. I’ve known people who’ve successfully done that (and a couple who unsuccessfully tried, but still had some great experiences out of it).
I’d just add this one important caveat — if the place you want to go is currently the center of a major crisis or disaster, STAY AWAY if you don’t have already have a job to do there. Unless you have strong local language abilities and/or specific skills (blogging and social media don’t count) needed on the ground, at best you’ll be a distraction, at worst you’ll be another person who has to be helped. Don’t do it.