Welcome to TE!
+1 to what everyone else has said. The race is very doable and you have plenty of time to prepare. Aim to finish, with a smile and you will feel fantastic! We know you can do it.
I am a duathlete and my best peice of advice from my very first race - "Stay in the small ring" on your bike. I was so busy watching what other people were doing, and thought I could do the same...
what was I thinking! I spent a lot of that race in the big ring and it totally fried my legs for the 2nd run.
"You can't get what you want till you know what you want." Joe Jackson
2006 Cannondale Feminine/Ultegra/Jett
2012 Trek Speed Concept 9.5/Ultegra/saddle TBD