First of all, remind yourself that the teacher isn't the only authority figure at the conference. You're meeting as equals who share an interest in your child's education.
Think of the conference as an opportunity to ensure that your kid is getting the most out of school. When else do you get the teacher's undivided attention? Best of all, he or she will be able to give you some insight into how your child behaves in a classroom setting (i.e. when you're not around).
This is also your chance to ask a few questions. You can find out about the teacher's educational approach and methods for maintaining classroom order. Before heading off for the meeting, it's a good idea to write down a list of questions. One tip: Try not to be confrontational. Be polite, and really listen to the teacher's response. After all, you want the teacher to be on your (and your child's) side.
When it's all over, you should feel like you've established a partnership with the teacher. This open relationship will allow you to work together in the best interests of your child's education.