If someone asks a question you don't know the answer to, tell them that you don't know, but you'll be happy to send them to someone who does know. Once you've found the someone, stick around and listen so you know for next time. (I am constantly doing this on the mechanical stuff, and the BMX bikes.)

Read up on the product, especially areas you feel you're weak in. If you ride a road bike, you can probably talk at length about road bikes. Stay abreast of any changes (like New Sora), but definitely familiarize yourself with mountain/hybrid components and the basics of suspension forks.

Smile!