I don't like the baby whisperer. If your baby doesn't fit her profile, you are a bad parent and making a rod for your own back. We all know that its best for the baby's development and your milk supply to breastfeed on demand but this doesn't fit in with her system. When your baby is having a growth spurt at 4 months, you don't give more breastmilk, you start solids. completely contradicts UK guidelines as well as not giving the baby the best nutrition for their growth spurt.
BW is about making the baby fit the profile rather than meeting their different and varying needs.
so no, I don't recommend it. I thought that a routine was the key to being a good parent for a while with DD but now i know that this is NOT what is meant by babies needing routine. (they mean they need to trust their caregivers, be in familiar places, handled in a predictable way etc)
Babies are meant to feed to sleep. Breast milk has a dozy effect and the sucking is relaxing for them (if you don't want your boob meet this instinct, try a dummy).
No cry sleep solution has a good reputation but i've never needed it because by about 8 months they have started to be able to settle themselves without being taught. also, DH is able to settle.
I do use a sling so on the odd occasion we've gone out and left a little one, they are settled in the sling (which is a familiar and comfy sleeping position for them)