Honestly, and you're not going to want to hear this, but sleep gets or stays bad at around 4 months, so any kind of sleep training is probably going to derail during the 4-month sleep regression.

There are just so many developmental changes during this time that sleep is hard to come by in long stretches.
I agree that NCSS is a bit scattered, and when you're that tired, you just want bullet points on what to do! It has some good tips, but my experience was that I was too tired to really do the plan whole hog, so I scrapped it for the time being. I'm trying something now that was inspired by NCSS, but DD is 9 months old, so sleep "guiding" (not really training) is more appropriate for her age than 3 months.
I also agree with the sidecar crib suggestion if you aren't already co-sleeping. When we had the crib sidecarred, all I had to do was roll over to feed Peepers, and I never had to pick her up. We had to put the side rail of the crib up when she started scooting on her back all the way across my bed!
Remember that sleep begets sleep. Good naps are important for good nighttime sleep. Have you read "Happiest Baby on the Block"? That book was a lifesaver during that 4-month sleep regression nightmare. Swaddling and a sound machine have been must-haves in my house.