There is a guy with chin length hair-actually I'd say longer, he can tie it back-now in final year at my school. He was the student council president last year and is really nice.
I agree with others, as long as you look clean and presentable and show you respect the profession, it *shouldn't* matter. Having said that, as a nurse you would be assisting in surgery, restraining animals etc. etc. so long dangly jewellery, things that could get caught, hair not tied back (can get caught) and NOT looking professional may discourage a uni, as these things would not be appropriate in the profession. If possible, I would probably recommend studs and/or taking the piercings out as more subtle/less likely to get caught and therefore more respectful/aware of risk options. But that's just me-by no means am I knowledgeable in this area.
Best of luck with your interview and (hopeful) future career!