Answering difficult interview questions

Try to anticipate the less obvious questions you may be asked about your skills and achievements and reinforce your replies by giving tangible examples. If you need a moment to think about your response, do not be afraid to respond with thats a very interesting question, I would like a moment to think about that, or ask the question to be repeated.
Answer questions as directly as possible, dont be tempted to waffle. Techniques, such as the STAR technique can help you with this. The idea is to try and impart as much information as you can about what you have done and how you can contribute, so make sure that you have quantifiable evidence to back up your answers.