The key to master lying is to believe in the lie yourself.

If you cannot trust you, how can anybody trust you?

If you smirk while telling the police you're innocent of your wife's death, you've failed.

If you can't stick to your story and stutter as people raise their eyebrows, you've failed.

If you can't smile and speak loudly in front of the class to cover up your shakiness, you've failed.

Learn the art of body language.

Learn the art of pushing tears and cracking voices and shaken hands, and cold, cold rasps. Learn the art of keeping your chin high and tough voice and clipped manner. Learn the art of applying it.

Learn the art of fitting a beautiful mask on your ugly face.

Learn the art of believing.

It's very simple: Believe in yourself.

Don't doubt, don't doubt, don't doubt.

Believe. Believe in the role. Live your character.

Fake it until you be it.