A brief review.
The First Five Chapters is straight forward and user-friendly. I used it as a checklist - Introduced main character? Check. Too many characters? Nope. Razzle-dazzle on the big words? Take out that adjective. Does the hook flow logically in the context of the pages? Umm. Let me get back to you on that.
Scene and Structure was way more intense. A textbook for serious writers, and no surprise that Jack Bickham used to be a creative writing professor. The book is predicated on a scene-sequel-scene form, where each sequel sets up the next scene. I think I got that right. It was hard to relate that to a shifting timeline. Does the present scene sequel set up the next present scene 15 pages later or does it literally set up the next scene even if the next scene is a time shift to the past?
I just read a book where the writer shifted deftly among points of view and past/present, and it worked great. My understanding is that anything goes as long as it is clearly identified in the chapter title or the first sentence for the reader.
And at some point, you just have to put the books down and write!