Having PATIENCE  2nd most important part

Try not to start the decal application, while in the middle of doing other things. Having kids or a pet in the room can cause a distraction. Decals have a slight static cling to them once removed from the backing paper. Animal fur or hair can be attracted to the static, and stick to the decals before applying them. Relax, wash up, and think of the best way to apply that particular decal. For example, its easier to apply the downtube decal if the frame has no parts installed yet, and is secured from moving.