Should be easy to change the motor. First unplug the power supply then remove the belt, platter, and arm wand. Then turn it on it's side and remove the metal plate under the motor. The wires are not soldered. They just use wire nuts. It should be easy to figure out what wires come from the motor. Once you figure that out disconnect them and mark them with tape if need be. Then remove the screws that hold the motor in and remove the motor. Pop in the new motor which hopefully has the same colored wires and reverse the process. You could also take a picture of the wiring before disassembling it so you don't forget how it went. It is really pretty simple wiring so that is not really necessary.
Hopefully they will send instructions with the motor. If your still uncomfortable messing with it I'm sure they can do it for you if you send it back to them.
Hopefully they will send instructions with the motor. If your still uncomfortable messing with it I'm sure they can do it for you if you send it back to them.