Initially when I moved my birds to the big coop I had roost at two, four, and six feet. The birds would jump up on the roost to look around but slept on the floor for the first few nights. I added a lower roost about eighteen inches and they started sleeping on that for about a week. After that it seemed they all made the move and were on the high roost at about ten days. I removed the lowest roost at this point, but left the lower two and four foot perch and added two more at six feet. They still jostle around for what the consider the best spots but there is enough room for all of them at six feet. All use the lower boards to get up onto the high roost and some use them to come down. Other just fly off to the floor.
As a side note, all the roost are 2x4's with the wide side parallel to the floor.
I wouldn't worry about all that putting them up and taking them down. They'll do that themselves when they are ready.
Do you plan to or do you have a night light that you'll leave on all night?