Researching the company and ensuring that your skills are what the hiring manager is looking for will be an important first step before answering this question in an interview.

You can answer like this: "To prepare for this position, I have done a great amount of research on your company and your clients to ensure that I am a good fit for this role. My years of experience as a public and private language interpreter also provided much preparation. Should I be given the opportunity, I know that I will be well prepared and ready."