Stuck With Sleep Training

Recently I feel that I am sort of stuck with sleep training. We are making NO progress. I just don't know how to take the next step. Danny can fall asleep by himself now but does not do it all the time. I think it's a great achievement that he knows that he can relax and fall asleep not only on the boob but while getting rocked or shhhhed or with my hand on his chest. He still prefers the breast as a means to relax and get ready for sleep. If I try to delay putting him on the boob and try to sing some lullabies for a while he gets VERY upset. I think he is afraid I won't give him his favorite pacifier... And I am afraid when he gets so upset that if I don't put him on the boob NOW he will never calm down and fall asleep :-(

So we are sort of stuck... reached a dead end... What to do next? How can I slowly teach him to calm down in any other than sucking on the breast way... I was thinking trying to withdraw earlier and earlier each day. Amd maybe then slowly we will minimize time on the boob and Danny will learn to soothe himself every time he goes to sleep. Thinking... thinking thinking...