Try to be pragmatic and present a holistic view, not just a copy book answer. Everybody has read PMBOK or Agile Manifesto, and that's partly important. People value the ground reality. For example, I mentioned that I am pen & paper guy who makes notes on daily basis and make a to do list while planning my day. Gantt chart is there, but I trust on my diary more than the charts. I believe in white board to draw a plan, product roadmap if required. Handling a customer is never an easy task and will never be. So be honest. Customer is a pain point and you feel the pain. Most of the times you are blown away by their demands. If you have taken help from your executives to push the client, as you have anticipated that tomorrow this can go out of proportion, please admit it. Don't try to project yourself as the 'Shaktiman,' because they happen only on screen. Escalating to the right authority on time and resolving a problem shows that you know when to seek for help and from whom. Ultimately the success of the project is important, not who did it.