CO-SLEEPING

My son has been sleeping in bed with me since we brought him home from the hospital, he's 4 months now... I was just wondering how did you move them from your bed to their crib and was it hard for you ? lol because I'm so attached to him but my husband is like ok babe I think it's time and I seriously wanna cry just thinking about it lol but I know he needs to sleep in his own bed or I'm in trouble in the long run lol and the crib will be right next to my bed by the way lol I'm just wondering how did you adjust to it ?