An expert is someone that feels the truth with their gut. Experts should not be confused with so-called experts who "know" the truth with their "heads." So-called experts are people who work in a field that can't be verified, such as the theoretical physics of "string theory," whereas real experts are people like Stephen Colbert, who have their own TV shows.
Anyone can be an expert. All you need to do to sound convincing is to throw out a couple of facts and then let your gut do the talking. Always keep a straight face: don't laugh or look uncomfortable. Always use certain hand gestures for getting your point across in a strong way -- you want to look "professional." One way "you" can "do" this is to "make" a "lot" of "air quote" signs with your "fingers" while you are "speaking." That will make you look like an expert for sure.
You can laugh when you get home, ok?
Stephen Colbert is an expert on truthiness, just ask him yourself.