My additional piece of advice is: drill all the most common motions, or motions that are initially counterintuitive, without poi, until well after you think they've become natural to you (e.g. Zan and Jon's recommendations for rehearsing flowers, hybrids, and CAPs). Not to say you should spend entire practice sessions doing that, but working in five, ten minutes (as a warmup, say) will help a lot. Once you start to get the body motions down, you can ignore them and focus on the details that involve the poi (planes, timing, cross-points, etc). If having the poi in your hands totally throws off the motion you've been practicing, it means you've probably just practiced it until it's familiar, and not until it's second nature.
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