Hi there. I'm a student at Edinburgh Napier in my final year. I'm actually in the Business School, so can't answer any questions directly to do with your course, but I have quite an extensive knowledge of the Uni itself, and would be able to put you in touch with someone if you have any specific course-related questions.
With regard to your interview, don't panic! As far as I'm aware, interviews aren't commonly required and students are usually only asked for interview if there is any confusion or anomalies to do with your application. BUT it might be different for your particular course. If you do get called in for an interview, all the University is looking to find out is how passionate you are about what you've chosen, and whether you have a good work ethic. Edinburgh Napier are a really inclusive Uni as opposed to exclusive, they want to ensure as many people as possible have access to a better future through education, so there will be no tricky or pressurising questions. It will mostly be about what led you to chose the course, how you'd apply yourself throughout, and what career plans you have.
Everyone is really friendly at the Uni, they'll make you feel completely comfortable and at ease. The important thing to remember is that the interview is not a test, its just a face-to-face to get a better insight into the person behind the application. Just be yourself and confident about what you want to achieve and they'll be more than welcoming.
Let me know if any other questions,
Sara