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EXCELLENT questions!!! With a group of 6 - allow 2 hour sessions for all to participate & don't meet weekly. People need time to process what's been read / discussed. Not really linked to hardcover - use that as a reference (a REALLY GOOD ONE) for your group sessions.
I loved the study guide... almost better than the book! This is broken down into applicable pieces that can be make sense for each number. It provides way of relating to others based on their numbers and is a great overview of the enneagram.