When I start to write a song, I have the words and I have the melody, and then it's just a matter of making it to the end. I think if I have something that I could identify as a talent, it would be that I can finish a song. I kind of know intuitively where the melody should go.
The best thing about writing fiction is that moment where the story catches fire and comes to life on the page, and suddenly it all makes sense and you know what it's about and why you're doing it and what these people are saying and doing, and you get to feel like both the creator and the audience. Everything is suddenly both obvious and surprising ("but of course that's why he was doing that, and that means that. . . ") and it's magic and wonderful and strange.