There is a bunch of great groups on Facebook too with Optifast users. I would start poking around now and get an idea of different "recipes" (additives in the shakes) that you can try to mix up the flavors.
I did a LOT of reading while waiting to get on the program and I am so glad I did - helped me get mentally prepared - I knew there were going to be days in the beginning that were hard, but I read from many that once they got through them it was incredibly easier. I have been on the program since April 4th (25 days) and it has indeed become easy. My biggest "problem" is going "Hmm....do I want Chocolate, vanilla, or strawberry??"