If writing a book is the most difficult, the editing process is the most grueling. Young aspiring writers like to point to Jack Kerouac, who supposedly wrote On the Road in a three-week drug-fueled blitz. What they leave out is the six years he spent editing and refining it until it was finally ready.
Superb breakdown of what it takes to create a book. (Sidenote: This is/was one of my goals for 2017. I should probably get moving on that…)