Kenny G is a master of his craft. He practices relentlessly to make it look effortless. Your books have a similar effortlessness about them. It looks like you just sat down and in a week or two, you just spooled this out. Is the fifth one better than the first one? I would say that the practice does get better the more you do it.
Author Ryan Holiday talks about his book, Discipline Is Destiny, with EconTalk host Russ Roberts. Holiday discusses the mentor who taught him discipline, the self-control of Queen Elizabeth, the world-champion boxer who counseled the man who defeated him in the ring, and the forgotten Roman emperor who helped make Marcus Aurelius the man he would become.