The Writer's Whisperer

What happens behind the scenes when I first meet a new or veteran writer at his initial and virginal phase of the writing of his book?

The writer comes with a lot of ideas, questions and insecurities equipped with a sea of notes and papers full of handwriting, some with cumbersome sentences, unfinished and unstructured but I recognize beneath the lines a tiny spark of light that I want to illuminate this point and show him the starting point and then we can expand this to a brighter light in order to spread it to the rest of the readers' world.