A very important aspect and which I, to a large extent, did not realise would entail so much thought, was the chapter order.  After NaNoWriMo, I opted to create many new chapters.  After doing so, and on such completion, there became the question of "exactly where best to slot these new chapters into my already created document".   Therefore when I did eventually decide, I had in the process created the necessity for new edits in many of the already existing chapters.

My story had evolved and I had created for myself a Jigsaw puzzle.

In doing so I am creating clarity.