I selected this book because of the idea the title suggests: making tiny changes instead of big ones, so I can improve annoying processes without messing up the ones that work well.
A concept like that had been on my mind before I started reading. I found valuable additional thoughts in this book.
I have run a few tiny experiments by now and they work nicely for me. E.g. I developed a 3 min neck and shoulder exercise that I actually do regularly, because it is tiny and simple and it seems to solve the problem it was meant to solve. (After about a month I can't be sure, of course.)
I was less interested in the chapters that did not directly relate to tiny experiments and just skimmed over a few as I usually do with ambitious, somewhat bloated self help books.