This is it:

Ask yourself: What tasks will be required of the person who fills this position? What kinds of skills do you have that will ensure your success at performing these tasks? Think broadly about your past experience. Think about volunteer work you may have done that could be applicable. Just because you weren’t paid to do it doesn’t make the work any less real or valuable. Write down these examples. Know them. You should be able to find ways throughout the interview to talk about these skills easily and readily. Which brings me to my next point.

Also check out the picture below. Then read the rest of the above advice here: http://www.forbes.com/sites/ellevate/2011/08/03/the-interview-your-most-important-presentation/#b07db0e614b6

And never be jobless in your life.