A: Yes. Harder. Definitely.
Non-fiction is supposedly less free than fiction because you, the writer, are limited by facts. You build a mound of facts, like a mound of clay, from interviews, observations, documents, readings, whatever else you can gather. The size of the mound depends upon how much skill, time and luck you have. When the mound is ready, you sculpt away whatever is unnecessary. What remains is your story. You are limited by the materials you can collect. Which can be a blessing.
Fiction allows you to create whatever facts you need to tell the story you want to tell, and change them as you go. The mound from which you sculpt is infinitely large, containing anything you can imagine and everything you’ve seen, heard, overheard, smelled, tasted, and felt in your life. Because your storytelling materials are unlimited, every sentence you write involves a choice that will have implications for sentences to follow–which can be a paralyzing curse.
So non-fiction and fiction are different forms that seek the same end: keeping the reader reading. The trick to this often has as much to do with what you choose to leave out as what you choose to leave in. For me, that’s what makes writing both fiction and non-fiction so invigorating and fun.