First of all, NONE of the methods anywhere will work until a child is around 12 weeks old. The babywise ROUTINE is the part that helps establish healthy sleeping habits. However, it doesn't take into account some things like "cluster feeding." But the basic idea about sleeping is that the baby can learn to fall asleep on his own if you let him. If you let him get used to being in bed with you, rocking, nursing, etc., then that's what you're signing up to do at bed time for the next year or two. As far as the wonderful moment when you go to sleep at 10 and don't wake up til 6 -- it can happen at 8 weeks for some, but maybe not until 15 weeks for others. A newborn is simply programmed to cry and eat often. They have a lot of growing to do and that's how they get it done. Also, note that 6 hours is considered "sleeping all night" for a baby. For the first month of a baby's life, all they need is food, diaper changes and sleep. Do what you need to do to survive. My first child was the perfect "babywise" baby. We'd put her in her bassinet when she was drowsy and she'd peacefully drift off into a lengthy nap. Baby #2 was a different story. He was only quiet if he was touching me. He needed to eat every 2 hours for 2 weeks. The only sleep any of us got for 2 weeks or more was when he was tucked in next to me in the rocker/recliner. However, I persisted with the routine of sleep, eat, wake/play. And we prepared ourselves for some crying once we recovered from the initial shock of having a newborn in our house again. When you have other munchkins running around the house, it is simply not practical to need to sit with a baby for half an hour or hold a baby to get him to sleep. So, I had to let my second child cry. A lot. It was probably not an extraordinary amount of crying, but compared to that peaceful first baby, it was more noise than we'd imagined. By the time he was around 8 weeks old, we'd learned some things about him. One was that he need to cry exactly 18 minutes before falling asleep. I swear it was true. We timed it. The sitter timed it. Eighteen minutes, one last loud holler, then out like a light. We only learned this because I was always going to check on him every 10 minutes and it would go on and on and I was tired, so one day I just turned off the baby monitor for 20 minutes just to get some peace. Later, he used a pacifier and would dive into his crib and get to sleep on his own with hardly a peep (just like his big sister had done). Babywise says don't use them, but we have only ever used it for sleeping. He will be 2 in a week and we just weaned him from the paci 2 weks ago. It's been a rough 2 weeks, but he's finally learned how to go to sleep totally on his own again. So, each baby needs something different in order to get themselves to sleep. A blankie, a special CD, a stuffed toy, a paci, a thumb, whatever. The point is to make sure it's not YOU, or you will continue to be exhausted for years.
Oh, and I have to add that my second child is the most independent as well as the most loving and cuddly of the two, so those 18-minute cries for a few weeks obviously did him no harm :-)