Starting Insanity tomorrow... Any advice??

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Okay, so I'm starting up Insanity tomorrow and I am wondering (1) if anybody has done it - and finished it! and (2) what advice would you give to finishing the whole system?? I've had the DVDs for about a year and I've attempted to start at least 5 times but I don't think I've ever gotten through the first week each time! Any advice is welcomed!!