Hi Alison
Once you have your luggage just head out following the exit signs and you'll see someone with a JY clipboard. They're looking out for you so don't worry. If for any reason you don't see them just stay where you are with you JY label clearly visible and they, or a fellow traveller, will find you.
We all have fears, particularly on our first trip, but everything will be fine, you can tell that by the number of us who return time and time again. Enjoy your trip
Rose