Its very easy to use; just load the applicator and apply the backing tray on opposite side and embed. Use it on a backpack, purse, jacket, jeans, tops, skirts, hats and much more. Its also great for parties, gifts, costumes, etc. Complete set includes applicator, backing tray, and 30 gems. Additional studs, and gems can be found at standard craft stores. Go! bedazzle yourself.