S.H.
We chose to put both of our kids in their own crib/bedroom at the 4-5 month mark. Both were with us in our room in co-sleeper as well. The transition was easier on the babies than on me. I think the longer you wait, the more difficult it is going to be. My vote is to just get him in his own room/crib now and avoid all of the pitfalls later when he gets older! I do now love having my own room back again with my husband :-) It didn't take long to adjust... just a couple of days for me, however both my kids both adjusted fine... they didn't skip a beat (which won't be the case the longer you wait and more aware they get)! Good luck to you and your family :-)