We did this WITHOUT any lounge visits or falls.

1. make sure she cant open her bedroom door. If she can put a safety gate in front of it so she can open the door but not get out without you letting her out.

2. start off with the mattress on the floor. you can even set up a video camera in the room to watch what they get up to and see if they roll out of bed during the night.

Once you know they are staying on the mattress all night you can set the bed up. when she no longer wakes or fights going to sleep, or knows how to open the safety gate, remove it.