Yes, preparation is key . . . it takes work.

As suggested, go online and review the common interview questions, and also the ones that have personally hung you up while interviewing. Put them down on paper. Then start responding to them on paper. You don't have to do this all in one sitting. Work on it intermittently. You'll likely find yourself just driving down the road or doing laundry or whatever not even consciously thinking about when a response will pop into your head. Jot it down on a note pad, type into your phone. Then compile it later when you have time. Then, review your responses here and there over time, get comfortable with. Work it into your resume and vice versa. STUDY it when you have an interview scheduled. Repeat as necessary. Get job!