Prepping for a show is a great learning experience! You learn a lot about how your body responds to changes in your macro nutrient profile. And never worry about how you place, you simply work on bringing your best package to the stage.
Get the "Perfect Posing" video from Gary Udit. It helps to learn how to pose starting from your feet, and working your way up. Bad posing is pretty bad, and good posing allows you to display the package you've worked so hard to improve. Good luck, and if you choose to do it, put together a log, and I'll be interested to follow it.