New motivation

I have some new found motivation in my quest for weight loss. I am going to a wedding in May. In Florida. You know florida, beaches and bikinis. Hah! I most certainly won't be slipping into one of those any time soon, or ever. But I would like to not look like a cow in my new dress. (I have yet to shop for one though, I would like to drop a size or two before then) My goal is to be 175 by then. That is 20 lbs in ten weeks. Totally doable. Right?