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If you are interested in doing the eight week mindfulness course, then I would highly recommend you read some if not all of the book Full Catastrophe Living by Jon Kabat-Zinn which details both the contents of the course, and the spirit in which one should practice. It's quite a big book, but all those I know that have read it have found it tremendously helpful. It is filled with insight and wisdom, and brought to life through the use of lots of personal examples from mindfulness classes. Highly recommended!