Saturday we are going to start transitioning J to his room. I'm so nervous! He doesn't like sleeping…

Saturday we are going to start transitioning J to his room. I'm so nervous! He doesn't like sleeping in his bassinet anymore and for the last 4 days he has been waking up when I go to put him in there, so he's been sleeping on our bed. (Husband is sleeping in the other room because his alarms would wake the baby)

Does anybody have any suggestions on what to do and how to go about it? Especially with a baby that only ever wants to nurse laying down? I never had to worry about it with my daughter because she went right to sleeping in her room at 6 months with no issue, but she also wasn't breastfed.