It has worked! I only had to go out 2 nights in a row and set birds before they all got it. The 2nd night when I went out, 5 pullets were already on the roost. So I picked up the others and put them up there. The 3rd night, I went out and they were all up there!! I went out at about 10pm, giving them time to really settle in.
I am amazed! I only had to go out one night to place them on the roost and they have gone there every night since then! Happy to have them off the ground and they seem completely content!