"Knowledge is power", said a famous philosopher Francis Bacon. For a while, you'll need to turn into an enterprising and resourceful detective or an intelligence agent and dig up as much information as possible about the following issues: Job responsibilities and requirements Company products/ services Company mission and core values Company structure Competitors Your interviewer Your potential boss
You can also practice in front of a mirror trying to pay attention not only to your speaking but also to your posture, gestures and mimics.
Even if the interviewer doesn't ask you about your strengths, be prepared to mention them when the opportunity presents itself. You'll need to formulate at least three abilities and support them with examples
Write down challenging projects and vivid situations where you displayed both your knowledge and abilities, preferably for each skill in your job description.