Healthy Sleep Habits Book...question

So I have read through a lot of the book and hopefully one day I can make it work But I am really confused- DS is almost 8 weeks old so in that section it has a part about CIO but at the same time it says to not let him cry. What I have been doing is letting him fuss but if he really starts crying I go to him. Am I missing something? Honestly, I'm having a hard time figureing out when to put him down. I will think he is tired so I swaddle him and put him in the crib and then I look on the monitor and he is wide awake!! Last night it took him over an hour to go to sleep after laying in his crib wide awake (not crying) and then was up 2 hours later and wouldn't go back to sleep. So frustrating!! I know it's still early, but when you read the book you feel like it should work right away

Re: Healthy Sleep Habits Book...question

hmm...not sure. I started with everything in the book at 4 1/2 months. I followed it mostly, but DD doesn't totally follow their nap schedule. Plus, if I did follow the exact nap schedule I would never leave the house b/c DD will fall asleep with any car ride!