the best advice is just to just stay calm! just handle it like any other flight! you know what you are doing, so just go out and do your thing! before you know it, it'll be over and you'll be like, "wow! that was awesome!"
I remember when i 1st soloed in the pattern at BVI. Did my 3 full stop-taxi backs, and when i came around again, I asked to go back out again, but my instructor in the tower said, "No, you've had enough! Bring it on back!"
10 minutes after you're goin, your adrenaline and nerves will chill and you'll fly the thing like a pro!
Have fun and good luck to ya!!