I regularly reread when I feel I loses it (my son was three years old, do not bother to make you drawing!). Case in point: for one week, no way to give a shower, or change a diaper or putting pajamas without screaming, crying or kicking (or all three at once). I read the chapter on the opposition there two days, and since everything is done more calmly ... Of course, it takes patience and time! But this calm is vital to family life.
I also really like this book because it takes a clear position against the slapping and spanking, with good arguments in support.
We can blame it to pass too quickly on some thorny issues (eg the bed), but also its synthetic side making it an affordable and easy tool to check. No big speeches, but simple explanations which quickly put things in their place.