i honestly recommend it. Robert Bruce has some good books in that area. check out his site astral dynamics. com
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Year I know his rope method and all but but it doesn’t work for me. OK I’ll research more and tell you when I’ve achieved it.
I’ve read it 
3 years ago 33rd edition
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I’ve split this from the Intro thread into its own topic because it’s a long conversation and kind of deserves its own thread, also, it might be useful for other people browing this section.
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I read the Peter levenda version