Floating Floor

It's been many moons since I put down a floating wood floor. I have one room I want to do. I have the materials but I can't remember exactly how I go about it. The room has furniture on all 4 walls. Now my intention is to lay a thin 3mm layer of ply over the old wood floor. Next comes the foam then the boards. My question is: could I get away with only emptying , say half the room, then move what furniture is left and do the 2 nd half, It's a big chore to move it all out. I've got appliance rollers so I can move the heavier stuff OK. I would have some help in doing all this.