People are fearful. It is just part of who we are. Some people are terrified of heights, others are terrified of spiders, and many, many people are afraid of public speaking. Public speaking could even include something as simple as a telephone call to a distant relative to gain more genealogical information. Have a list of questions ready and names and dates of ancestors on hand. Ask a couple of questions to jog their memory and find out if they're willing to help. Just remember to be thoughtful about their time!