Both JG Voice of Enki and HPS Lydia gave instructions on this. To develop your astral sight properly you need to be at a certain level of development. Focus, Trance, Cleaning and general advancement are all important.
Today, on Samhain I've started this working to further improve my astral senses and reconnect to a greater extend to my astral body and soul. First of all I want to apologize for not managing to write this down earlier, since for most people on the eastern hemisphere (including europe and such)...
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Tomorrow (Sunday), waxing Moon in Pisces, and it is Fall Equinox. Good day to begin a daily working for astral senses. The trick is to work on them every single day from now until indefinitely. If you miss a day, don't worry, do it the next day, even twice the next day. The energy is still...
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More info from HPS Lydia:
"I would suggest to work on your psychic senses to at least be able to get some guidance from your GD. This coming Monday is Moon in Cancer, a good time to begin workings for astral senses. The name-mantras Inanna and Isis are very effective.
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The meditations I've done are the ones on the JoS. I just kept at it, working on chakras, the Veil of Isis mantra (EE-SS-EE-SS) HPS Maxine wrote in the yahoo groups, INANNA, trance. But make sure to never fry yourself, you can go in cycles and not constantly. I took time off from empowerment meditations and my senses developed further from focusing more on cleaning.
Don't push yourself too hard, but be consistent, at least in cycles. Like 90 days of a mantra to open psychic senses, then some time off, then do it again. That's how I did it.
Another thing I feel was useful, is working with colors. Breathing the colors into each chakra, seeing the colors. This gives practice with astral sight."