So when I got pregnant, I was both nervous and excited. I might not have felt comfortable holding newborns then, but surely after holding my own for hour upon hour I would get the hang of it. I would learn.
Nine months later, when the nurse put my little girl in my arms and I held her for the first time, there was no awkwardness, no discomfort. It felt so completely natural, so right. I didn't have to learn how to hold her, I just suddenly knew. It was the most incredible feeling. This was my little girl, and we fit.
Interestingly, I no longer feel uncomfortable holding other people's babies, either. My intuition with Isabella applies to others, also. I don't worry about what to do with that wobbly head, and I know so many positions other than the cradle hold that I don't trick babies into thinking it's meal time anymore (it was always awkward when babies started rooting when I held them as a teenager).
The moral of the story: if you feel uncomfortable holding babies, have one of your own, and all of that will disappear.