I replaced a popcorn ceiling with these tiles in my dining room. There is a bit of a learning curve when applying the adhesive (I used locktite power grip) and cutting the tiles but I was able to complete the entire project myself. I did remove the popcorn ceiling beforehand and applied White PVC 3/4 inch White Edge Banding (the kind with ready to go adhesive) to cover all of the edges between the tiles. I am floored by the transformation it has made to the room. It looks incredible.