I worked in photography studio for about 5 months to save up money first. Shouldn't be a problem for you either, if you cut down on your living costs and keep your expenses on a minimum.
That book didn't seem to relevant for backpacking. If you want to do some research first I would recommend visiting the forum on the Lonely Planet website. That site also has short but useful guides to just about every (i think it is actually every) country in the world. It also has information about the current state of affairs if you have safety-concerns. Don't let the warnings get to you that bad tough. Just about every country has a warning, you just have to read them and consider how serious the safety threat really is.
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