Know that you are prepared. Know that you have done everything you could of done to prepare. This is the moment you have been anticipating and this is the moment you will show you are the right person for the job. Do not let any tell you otherwise.
You must take advantage of every opportunity. See what you want and have the cojones to go out and get it. Nothing is going to be given to you. You must go out and earn everything. Know your worth and do not accept anything less.