I'm weird, but I always lose weight from the ground up. It's frustrating for me, since I tend to carry most of my weight in my upper body. There's always a size differential between my lower half and my upper half, so dresses have rarely been part of my wardrobe (they either fit in the hips and smoosh my chest, or they fit on top and hang about my lower section like a tent).
They call my body type an "apple" type. Women who are slenderer up top and wider in the hips are called "pears." Then there are those lucky women with the "hourglass" figures (like BonitaGirl, what a cutie!). I think that we each lose weight in different places first based on these types, and most likely the opposite of where we would most like!
As far as preparing yourself, we've all been different about that, too. Some of us went low carb for a while in advance to help prepare. Me, I just stuffed myself sick on spaghetti the night before!
Your idea about water is a good one, though, because water is ALWAYS a good thing
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Kimbob the Red Delicious