Hi R.,
I was going to suggest the Weissbluth book too. It makes a lot of sense to me, and has come highly recommended.
My son just turned 3 months (our first child) and we haven't started sleep training him yet in an official way. The books say to start only at 4 months unless you're desperate.
He is sleeping typically 5,5-8 hours, up for a feeding, then down again for 4-2 hours (his night sleep lasts about 10-11 hours, broken by the nursing.)
We started out with him in a co-sleeper, and when I was pregnant thought we'd have him in the room with us until he was at least 6months to a year, and I also thought that sleep training was bad and mean! Well, we moved him into his crib in the nursery at 5 weeks because we found that he actually slept better that way! Discovered this after his napping was better in there. After a few weeks of this, my husband traveled for business, and I put him in the co-sleeper because I had anxiety that day about SIDS (irrationally so). We both slept terribly! He was up every couple of hours. I think it was because he could hear me rustling about, and could smell the milk. And HE is a little grunter and squealer in his sleep, which kept waking me up. At least with the monitor and a fan in his room, his noises are muffled unless they continue long enough for me to know he is actually awake and needs attention. (He has NEVER cried for me at night, he only fusses a bit and he knows his mommy will come and get him. Or his daddy on the weekends with a bottle - yay!)
I have now come to the conclusion that sleep training is actually a loving thing to do for your child. The HSHHC books says you wouldn't feed junk food to your child, why would you 'junk sleep' him? I can put my baby down drowsy but awake and he'll go off to sleep, and after his night feeding too. I'm pretty sure he feels safe and secure, and when he is awake and needs the attention he gets it. I know plenty of people who breastfed for a long time, and didn't co-sleep, so that doesn't have to be an issue.
Ultimately you have to do what is best for your family, what works for all of you to get your rest, and keep your sanity.
All the best to you!