It is fairly involved and quite tedious to do correctly. You have to set the input shaft preload first. You will need a dial indicator and an inch/lb or low NM torque wrench. The sweep/needle style wrench.
After that is set you have to start the process with the output shaft. Then set the Differential preload, once that is correct go back to the output shaft.
Do you have WIS? If you don't you really should get it. It will make the process a lot easier. It gives all the specs as well as procedures. It has different specs depending on if you are using new or used cases and if you are using new or old bearings.
I am building a box right now, as soon as my bearings show up I am assembling it. I can take pictures and do a write up for you if you would like.