1.first you have to hammer out the old cups from your headtube. i use a hammer and a stock steering column or a hammer and big screw driver for this.
2. then hammer in the new cups. start off by lightly tapping the cup directly with the hammer just to get it started. after you get it started, get a block of wood and put it on top of the cup. do not directly pound the cup all the way in or run the risk of bending and breaking the cup. the block of wood prevents the cup from being damaged. then just put in your bearings and assemble your scooter and you are done