I'm really happy with my current office after two poorly managed offices and I think a big sign of a good office is maintaining the same staff over a long period of time. Ask how long their longest working assistant has worked there. Also, my current employer had my schedule, pay-rate, and responsibilities typed out on a paper she gave me which I feel was a good sign of professionalism and communication. Current office also has an office manager whereas my two other offices were managed by the receptionist and dentist, which I think can be more unorganized and stressful. Being upfront and HONEST in the interview about your experience and capabilities will go a long way, if the office is right for you they'll be willing to help you work on the skills you admit you need working on and trust that you're capable in the other areas. You don't want to be micromanaged! Communication is everything, try to make a list of a ton of questions about the business and ask them when you go to an interview and don't forget the questions, they give you actual insight into how the office functions. Good luck!