Just dress professionally and be yourself.
You should be knowing how to present yourself and your past experiences with jobs and other social things. No lies at all. Should know at least a bit about the company you are applying into as it's always a bonus point.
I would have a list of questions to ask about the company and want to know what they expected of me.
Focus on what you do know, what you have that can help you adjust to the job. The work is easy, just have to learn it. Show a desire to learn and work hard.
Be prepared to have knowledge on the position being applied for.
Become knowledgeable of the department in which you have applied for
Prepare for a lot of question, they care about why you want to work there, and your available time
Kind dress well