Things needed for a carrier change
To change out your existing carrier and install an ARB, is not that bad.
You will need four special pieces of equipment,
1) A magnetic indicator base and a 0-1" dial indicator. (to check your back lash to within .005-.008.
2) 0-1" O.D. micrometer ( to measure your existing shims and measure your new set to match the correct thickness)
3)0-6" large base depth micrometer ( to measure your existing carrier and your new ARB.
4)10-100 lbs torque wrench ( to torque the ring gear to the new carrier, re-torque the bearing caps, axle lock plates and diff cover )
Since ARB had changed its design and the Master shim and shim packs now go on the outside of the drivers side bearing with the Actuator holding them in it is easy to do the exchange. After you get the new carrier in you have to dykem blue the ring and pinion to see the gear imprint and how well they mesh. Setting the correct back lash requires you to move your shims from one side to the other till you get the right right back last in four places (90 degrees) on your ring gear.
But If you have never attempted something like this or not too sure of your mechanical abilities I would recommend that you look into having a shop do this.
The cost is reasonable at 225$ per axle.
But that is taking into account that you have spent a few hours mounting the compressor and activator solenoid for them.