Just booked my 1st speaking engagement

Just booked my 1st speaking engagement A few weeks ago I submitted 2 papers to be reviewed as part of an application to speak at a medium-sized tech conference in Budapest in March. Well, one of my papers was chosen and I will be presenting a 45-minute session! There will be approximately 500 people at this conference, not sure how many will attend my session. I'm a small business owner and this event will be a great marketing opportunity for us. I'm terrified but I will do my best!