I have gone from cosleeping/BFing to sleep to sleeping in cot in own room with 3 DDs now.
I did it later though at around a year as by that time I knew it was habit to wake and want boob not food related.
What we did was cold turkey, BF to sleep at 8pm as normal, then put in own cot, at first waking, Daddy went to them, I am completely out the picture and room so no chance of boob, Daddy sat with them, shhed them, patted them. Never left alone to cry, finally after about 30 mins they would fall back asleep, repeat as many times as necessary.
First night is always tough but after that it got easier so second night would be like 5 mins of sshing, third night they were sleeping through.
I tried NCSS pull off technique with DD2 never worked and I think she would completely refuse a dummy at this age as well.