Go for it! Once you get up there you may find that you love it and think of the pleasure you will have missed if you don't try it. YOu may make a mistake or two because you are nervous but it doesn't matter, you're far from alone. Play something you love and can play backwards and forwards easily. That way you'll have a less of a chance of making a mistake, or any that you make you can recover from quickly, and the love of the piece will show through and that's a lot of what people like to see in a performer.