How difficult is it to do. Mine started clicking today.

 

Its extremely easy. 30 min worth of work. Its only 2 or 3 bolts holding it on, and a couple nuts that hold the wires on it. The biggest thing u HAVE to be careful about is to make sure you either unbolt the wires first, or have a way to support the starter once you drop it down. The sucker is heavy, and the last thing you want is to tear off the wires because it drops. For best results, jus undo the wires 1st. Oh, and dont forget to unplug negative on your battery. It sparks a lot if you dont lol. Personal experience.