Hi Mizzuno.
They already like you, and now they want to like you in person.
I've learned that the less I obsess about an interview, the better prepared I am. Like watching an episode of Dexter on my way to the interview. (I live in Manhattan, so cabs and subways are my modes of transportation.) Whenever possible, I've walked to interviews when they've been less than three miles or so from where I live, to clear my head and shake off the jitters.
They already know about your abilities; now they want to feel comfortable working with you.