I haven't read the this thread all the way through so I am replying directtly to the op.
My son screamed from day 1 until I took him to the cranial (sp?) osteopath where, quite by fluke, my ds eneded up on his tummy. It was like flicking a switch, he immediately went to sleep. Now, this created one heck of a dilema for me and dh.
The HV, of course, was not happy. We discussed, read and asked advice among our peers.
In the end my dh stated that if you take all the books away, every persons' opinion, what would we do if it were just the two of us? What makes our son happy. what helps him to sleep?
From then on we put him on his tummy to sleep and he slept like he had never slept before...
Now, this is your decision and yes, you will worry about whatever you decide as this is totally natural as you are a caring and loving parent. We worried until he could roll over and decide exactly how he wanted to sleep.
He is now 3 and still, very much, a tummy sleeper.
I am a tummy sleeper and currently 23 weeks pg so have to sleep on my back adn hate it -why wouldn't our little ones?