The FSM will greatly help you on tearing it apart and reassembling it as well as getting the clearance to factory specs.
You will need special set of pliers (Sorry I don't know the proper name of them that , maybe someone who does know that name will chime in with it ) with serrations for spreading and holding the points on the rings, that are designed to remove the retaining rings that hold the output shaft bearing on the output shaft and the retaining rings on the output shaft that hold the gears on that shaft
As far as removing the ball bearings on the input and output shafts if you don't have access to a press with a bearing removing tool PM me on here for the redneck cowboy way No damages to the shafts or bearings either