Lowskiller, I'm no expert on Astral Projection, but I'd say as long as you raise your vibrations as soon as you get out of your body, any low vibrational entities will not be able to harm you. Also the fact that your leg has been jerking is a good sign- it means that your astral body is trying to get out, and when it fails and connects back with your physical it causes your leg to jerk (I think...=P)
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