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I don't think that it's too soon to book some of the big things, like the venue.. I am getting married the day after you are and we booked the venue in January because it was the place I had my heart set on and didn't want to risk not being able to get married when and where we wanted.
I have also started planning and executing some of my DIY projects so that I don't over-stress myself closer to the wedding. You certainly don't need your entire wedding planned in the next week but it doesn't hurt to knock out a few to-dos ahead of time :-)
Our wedding is the day after yours and I don't think its too soon! We booked the venue and caterer fairly early and locked in or date and 2013 prices. FI was surprised at how far out places were booked. If our wedding was a day earlier, we wouldn't have gotten our venue!
Also, consider, booking earlier gives you a little bit longer to pay. Its been a lot easier on our budget to pay as we go along then to try and pay all at once last minute.