Who put me in charge?

I can't choose dinner off a menu.  How  am I supposed to decide on a chapel, a hall, a caterer, a photographer, the entertainment and all the crap that goes with it?  My brain hurts.  Here's a kinda-sorta update. 

Tentatively we're planning on getting married July 12, 2008.  Yes, I'm serious.  I know it will be hot.  We'll all live.

We've looked at several places.  Each has its good points and each has bad.  We're talking, we're thinking and  as soon as we finish deciding, I'll let you know for sure.

The colors are black, white and royal blue. 
My sisters are the bridesmaids. 
Alex and Alicia are ring bearers.
Aaryn is my flower girl
We're not registered anywhere
I'm probably wearing blue or white Chuck Taylors
I'm getting the armadillo groom's cake
I want a margarita machine

I'm sure I'm leaving something out.  Please tell me what.  If you know a place, person or thing that can simplify this process, please let me know.