An icon pack is an app for your device. There is nothing special needed to install the icon pack itself. To use the icons though, you do need a "launcher" that supports icon packs. (See our "What Is a Launcher?" article for info, but basically a launcher is your phone's main interface.) This typically means using a 3rd party launcher. For some reason most phone manufacturers don't allow the use of icon packs on their launchers or come up with their own proprietary system for making and applying icon packs that is inferior to the standard used by our icon packs. We recommend using Nova launcher for the best experience. In general, you can achieve any look using this launcher that you are fond of. It may take a little bit of research and practice to get it how you like. But that is the fun of customization.