I received a phone call from a recruiter to ensure I was still in need of a new job. The next day, one of the managers contacted me for a phone interview. About two days after that, I received another phone call to setup an apt to go in for an interview. The interview itself was with two managers and two staff members, it lasted about two hours. Two days later, i was offered the position. The interview did not seem to be very organized. The managers review your resume and then pick certain topics to drill down on (they may not even be related to the job itself). Seems as though the best thing is to just be honest about what you know, if you don't know something, that is fine, just say so. They have an extremely long training program that you enter as soon as you are hired, they can teach you what you need to know.
Some of the people that perform the interview have no experience in interviewing at all - and seem more interested in hearing themselves talk rather than actually doing an interview.
There will be a background check prior to your start date.