mari,

let me second what annie said, the biggest problem with getting kids to accept a new routine is not backing down when tyhey make a fuss. This is their way of testing your limits. It is not easy, but set the rules and stick to them. If he sees you will not back down now this will make the next battle easier. Plus, when you do get him in his own room, you will still face the challenge, and it will be harder.