I don't know how they actually DO it, but I've had my palm read and someone did tarot cards on me and none of it was right... if that helps any. I don't believe in it at all.
Oh, wait! I had an aunt that was "spiritual"... my mom called her a "spritist." Each time I got pregnant she told me what I was going to have and she was right all three times. I wasn't even showing and the last time, it was by phone. She never did see me pregnant with that baby.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.