Hey Rob,
I know that some of these suggestions are obvious and that others may be viewed as extreme but they're conduct and grooming basics that have stood the test of time.
Make sure you're a few minutes early, dress well and conservatively, tattoos covered, minimal jewelry, and no cologne. It's always appropriate to have hair and especially facial hair neatly groomed or be clean shaven- no stubble. Be prepared with a copy of your resume and a binder to take notes or keep material that you may be given. When you meet, smile, make eye contact and give a firm handshake; no fingersrusher or limp dishrag. Know the name of your interviewer before the meeting and when your interview starts, hand that copy of your resume in an envelope, to the person. Do this even if you know that there's one right on the desk because in a very tangible way, it makes the statement that you're responsible, professional and prepared. During the interview, sit facing the person, with good posture and leaning slightly foreward in your chair. When asked questions, pause momentarily to think. It may feel like you're silent forever but it's just a second. You will avoid impulsive statements while formulating the best possible reply. Be sure to phrase things in a way that reflects your interest in doing the job well, learning a lot and contributing as much as possible.
This all may seem like too much to bother with but remember that it's you that you're selling, not your nursing experience, yet. You have to show good character. By dressing conservatively, you demonstrate that you are respectful of yourself and others especially patients you may work with. Your specific facility may be accepting of body art, alternative hair styles and jewelry so if after you're hired, your chance to express your individuality will come. Otherwise, it will wait for out of work time and you will not have committed the mistake of assumption.
Even when you do have nursing experience to market , don't forget that you the person, has to be sold too.
I've been on both sides of the desk, Good luck.
R