I have a few cheap basses I wanted to experiment with by changing the pickups and electronics. I have no idea how to do this. One bass is a Kramer and the other is an SX fretless. Can someone tell me what equipment i need and where I can get it? I assume I need sodder and a sodder gun. It seems all I would need to do is match the correct wires, but I really don't know. Any help would be appreciated.