This is what we did when my DS was that age, and I think this is what she was saying too... basically, is to get baby nice and drowsy. I remember reading this somewhere in the book- those early tired signs- the yawn and specific tired cry/fuss. As soon as I would notice those, I would take him in his room and help him wind down. (rocking chair, rock, etc), and when his eyes got heavy and started wanting to shut, then I put him in his crib. So he was still awake in his crib, but drowsy enough to not protest. That's how I weaned him from the first few weeks of being held all the time (I waited 9 months for him, and just wanted to hug him and spend those weeks soaking it all in!)
This is all past-tense, because when I went back to work (4 1/2 months), we let it all fall apart! Now he's 7 months and we're starting over. I wish this method would work again for us, but he doesn't get drowsy. He goes from awake, then I rock/walk to help him wind down, and he goes to "asleep" immedietely! There's no in-between anymore! And if he's WIDE awake when I put him in the crib, he wails. So I'm dealing with my own problems, but just wanted to give you my input on what worked when I was in your shoes. I wish we hadn't let things slip! HTH!
-Megan
P.S. You work nights- what do you do? I used to work nights (RN), and I always thought it would be that much harder if I had a baby at home... I hope you are getting enough rest!!!