Application of these wall stickers is very simple and hassle free, each order comes with instructions on how to apply. Clean the surface where you are going to apply, make sure the surface is smooth and dry. Peel off the back parper, it's better to peel on the same time sticking if it is a large part so that it won't stick together. Make it tight on your wall, wipe with a dry cloth over the sticker towards the edge to make sure there are no air bubbles left. Do not use if your walls are dirty or dusty, have mold or humidity spots or wall paint is lifting off. If the walls are freshly painted please allow it to dry at least 4 to 6 weeks. Keep them away from constant heat or direct flames.