The Pronto comes fully assembled and is easy to use with just one button. The coil tip is the white and silver piece that touches the wax. Press the button to heat the tip to a hot enough temperature to vaporize the concentrate. The coil is easy to assemble or remove, just unscrew it from the base or line up the threads and screw it on. When removing, just be sure to give it a few minutes to cool down completely.