Read the instructions, make notes in the book, practice on the cat (well done one of the authors). Read ALL previous comments. There are some great tips in the comments. I will not repeat myself. See how the battery works in different modes. Micro flashes eat a charge during measurements, so get used to it (there's nothing to be done). Attaching the lid to the body (only a micro-hole with a cord). Carefully handle the optics (dust, fingers) - cover the lens. Do not wear the device on your belly, it should not hang out. All the best.
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