i remember posting the same question but didn't get much help on this or other forums.
we did it anyway. it was an achievement. firstly, she had a v. firm mattress in her crib. i exchanged that with a slightly softer one. she hated the hard mattress. we started with letting her nap in it during the day.
then one night when she fell asleep i put her in the crib, she woke up right away but i just shushed her (had the white noise on in the background) and placed my hand on her to let for about 5 minutes or so. i also lay a pillow beside her because the crib was just too big for her and the pillow made it cozy. she fell off and from that night she slept in the crib but that certainly didn't mean she slept all night without waking up. she still wakes up every night a few times for her pacifier. she slept in the crib thru the night until we moved. in the new environment she wanted out of the crib in the middle of the night. she cosleeps part of the night now. the pillow is long gone as she could stand up on it.
When we change then the world can change. This is the current task that we all have to be engaged in ~ Unknown