Congrats to you!!! First, take a deep breath and give yourself some credit for being such a good mommy who's in-tune with her baby's needs. I co-slept with my son and didn't move him until 10 months, so you can do this. It honestly wasn't that bad, surprisingly. I got the best advice from my sister, who told me just to start somewhere and try something. If it doesn't work, tweak it or change it (I felt so overwhelmed, so this advice really helped!) Here's what I did: For me, it was easier to focus on the nap first. I tried to get my son to take those 2 consistent naps in his crib each day. Usually that meant waiting until he had fallen asleep nursing, then transferring him to the crib (this is so far NOT working for my second one!) Once I felt like the naps were significantly improved (not perfect though), I focused on night time sleep. I used the book you read and just modified things. I skipped the co-sleeper, because I found that I would fall asleep intending to put him back in the co=sleeper--it's just too close to the bed, and I can't stay awake. So I moved a glider into our room, and started putting him in the crib, and just feeding him while sitting in the glider--that way, I'd stay awake and put him back in the crib. This really sucked! Then I used a modified approach to cut down the night nursing. I decided I would only nurse him every 3 hours. If it had been less than 3 hours and he cried, my husband would go to him and soothe him. At first he didn't like it, but then he got used to my husband soothing him, and we had to wean him off that. It sounds awful but it really wasn't. Only took a few nights, and we never let him cry more than 15 minutes (you have to decide this time frame for yourself). We all started sleeping better.
So just start somewhere, and modify things so that you are comfortable. We started with the crib close to our bed, then moved it across the room, then finally into his own room. That was probably more for me than for my son. Regarding the night nursing, it's up to you as to whether you'd like to cut down on that now or not. Totally a personal choice, and I think you'll know--if you find you're getting extremely tired with the pregnancy and being wakened all night, then maybe you'll want to cut back? Remember too that some women have a milk supply decrease with pregnancy. My son nursed 4 months into my pregnancy and then weaned--I don't think there was anything left at that point (but everyone's different). Good luck and congrats again!!!