i usually wait until my baby is around 1 years old – sometimes a little before, but when i know that my baby truly isn’t hungry in the middle of the night. then i first wean my baby from nursing in the middle of the night. i’ll snuggle her when she cries, so even if she cries, i know that she’s not feeling abandoned. can take 1-2 weeks till she totally knows that she does not eat in middle of night. then about a month later – if she’s not sick, teething, etc. i wean her into a different room – much, much easier then.
right now, with my little baby, i first put her to sleep in crib in her room – when she awakens, she’ll come to my room. what i also do at times is put them for nap in their room, then at least get used to that room as being theirs, so is not as traumatic.