We have to take care of ourselves. If we feel overwhelmed by the things we see, we need to take care of our minds and souls. Meditate, pray, walk in a quiet place. Find the thing that helps us let go and re-center.

Yes, we need to prepare ourselves as best we can, but we also need to take care of ourselves so we can be as mentally prepared to handle whatever comes our way.
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Gather your supplies and tools, learn as much as you can, practice what you learn and help others when you can.