May,
You'll do great!! It says in HIS word that He has not given us the spirit of fear...
The feelings you are probably feeling are anticipation to do HIS will. It is the Spirit growing inside of you to cover you on your journey.
The first mission trip I went on I thought we were going in as the "great educated hope", but what God showed me was that if you'll prepare your heart you will receive as much if not more than you will give.

I want to hear all about it when you get back
p.s. Kick a little Satan buticus!
innerdawg