Its not the book its the baby.
Some babies have their own routines which may, by sheer luck, seem like a routine from a book.
Others have no routine at all, rather their routine is cry, feed, wake up the minute you put them down, 10 min power nap, cry feed etc etc.
Ds1 was the former. Woke up same time every day, feed, gurgle, nap, feed, gurgle, nap, sleep at night.
(I didn't even have a book!)
If I'd had a baby book I'd probably have put it down to that and be recommending the book to everyone.
I was so pfb and so convinced that this wonderful easy child was due to my superior parenting skills, that I used to tell other people what I did, and assume that this would work for them too.
Then I had ds2. NOTHIng in our parenting style had changed (apart from not being pfb obv). But he was totally different. In fact one friend seeing me after about a 10th night of constant feeds, laughed and said 'and are you doing all those things you told me to do?'
Just follow your own baby's routine.