You also have to know what questions to ask, how to get someone to answer, who might otherwise not want to answer. You have to know who to ask questions to, as well.
And you have to know how to write it all down in a way that both conveys what needs to be said, what was said, all in a way that will make others want to read it.
Honestly, it should require an education, if someone is going to be taken seriously and have the responsibility of imparting information to lots of people.