that's for a 2ds though, the 3ds does not have much space, you have to remove some stuff from the plastic and sand stuff down to make space for the coil.The charging mod itself is surprisingly simple, there's only two solder points on the board, and they're both on the charger jack, which is easily accessible as soon as the rear cover is removed (not the battery cover, the board cover). Any cell phone repair shop in your area could install this for you, as it doesn't require any special knowledge of the 3DS at all, just decent soldering skill.