Take your first show as a learning experience, do your best, and have fun!!
Also, remember, you can't control who else will show up, so you're really competing against yourself, so that each time you step on stage you're bringing your best condition to date.
Cycling the carbs sucks, but it does work so stay the course!
BTW, pics look very good. You've got a lot of muscle there. (no homo) LOL