I didn't think reccommendations were that pivotal in a decision. In fact, I secured recs for all the houses at UF (nearly...excepting DPhiE, I believe), and I was dropped by 9/15 houses after round 2.
So, from my understanding and personal experience, recs can only pull you through to round 2. From then on, you're on your own. Get them if you have the time, que sera if you don't.
The biggest thing that helped me in Zeta was a girl I knew from back home, not a random recommendation.
So, if you really want to get started an make yourself ready for Rush..some tips:
1) Clean up that Facebook! Make sure you have an appropriate Fb picture, quotes, etc. Of course don't change who you are or what you're about but nobody wants to see curse words or that kind of thing all over your page.
2) Talk to some girls you might've known in highschool who are now in college. I've gotten a few messages like this on Facebook and I'm more than happy to answer questions. They can sometimes give you some tips and pointers on Rush specific to your school.
3) Don't take Rush (as a process when you're going through it) super seriously. Do your best and be yourself and that's all anybody can ask of you. As mentioned previously, I was dropped by a little under half of the houses after Round 2. It happens - these things are arbitrary and/or I wasn't a good fit for the majority. The one thing I can say is that I was proud to be myself during all of the rounds and was pleasantly surprised and delighted when Zeta accepted me. I was assured I had made the right decision because I was myself throughout the entire process.