Co-sleeping

Question for the mommys out there who co-sleep! How hard was it for you to transition your child to a crib or bassinet? My daughter is two weeks old and has been sleeping in the bed with me. I am wanting to keep her in the bed with me for a few more weeks and then try to transition her to her bassinet or crib. How hard was it for you to transition your child and at what age did you decide to do so? Thanks!!