Jill1228 said it perfectly; that's exactly how I went about becoming an AI. And I'd also add to REALLY investigate which organization might fit you best--in other words, don't just contact/apply to a whole bunch and then weed through them. You want to know that the organization to which you're applying is one that fits your ideals, and one you'll wholeheartedly give your time and efforts to.
Good luck!
Liz
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