I went dress shopping at Saks. I was just going to check things out, because I was never going to spend that kind of money on a dress. Nooooo, not me....uh huh.
While I was there I fell in love with two dresses--a Kenneth Pool and a Monique Lhullier. So, I couldn't decide, and still thought that kind of money was a little much.
I found a custom designer that does couture quality work, and we sort of designed a combination dress. I still got my duchess silk satin and hand appliqued and embroidered lace, and I got to add details I wanted, like specific type of Swarovski crystals. (And actually, the ladies on here were a lot of help!)
So, my advice is to start looking as early as possible, take your time, try on everything, and HAVE FUN! It's hard work, but it is also lots of fun.