As been said several times RK - the most important thing is to do things you've done before and that you're very comfortable with. You won't know how your nerves will affect you because you've never been in this type of performance situation before. If you try something that you've never done before, even if you've practiced it a lot, most likely you'll end up messing up your performance due to unexpected responses, questions, reactions, or angles.
So far it seems that a few of the things you're considering you've just purchased or learned so there's no way you have enough experience yet to perform it in this setting. Learn to listen to people and what they're saying instead of just going by what you think without any real experience behind it to back it up.