Ask about regrets.
Do you have friends that have gotten married recently? They might be a good resource for planning your wedding. Sure, they probably gave you their HUGE stash of wedding magazines, but they have something else that you don't have. Experience.
Now don't get all mad at me. You are the only one that knows exactly what you want for your wedding day, but there is something to be said for your friend already going through the process. That is the main reason for this blog. This is typically your first time planning an event of this caliber and you can only do it once.
What did your friend do that she would do different? What things didn't she do that she wishes she had done? I talk with a huge number of girls who regret not hiring a videographer for their wedding. What are some other things?
Ask as many of your friends that you can. Learn from them and more importantly, implement them into your big day.