If I wanted to build a larger coop for my adult hens (the one they're in is tiny and impossible to maintain well) How would I go about switching the flock when it's ready for move in? Do I have to do it gradually? Do I have to put them in only the new coop first, then open it up to the run? Do I just let them free range a bit with the door to the new one open, then when it's time for them to go in for the night toss some treats in? Do I take them off the roost and move them? I have no idea how to do this.