From The Truth About Guns:

If you should find yourself in a position where people are coming to you for “gun advice,” that can be an ego boost. You’ve been a gun person your whole life and now your neighbor Jim has come to you wanting to know which gun he should buy to protect his family. 

The first thing you should do before you offer any advice is to take a deep breath, park your ego, and ask a few of questions to the person seeking your counsel.