Read, read, read, and lots of patience. You will be installing and removing parts several times to ensure the wear pattern is correct.
I replaced an open carrier with an Eaton in my wagon and it came out right with no noise. Since I was reusing the original gears, I did not need to calculate the pinion shim thickness.
I recommend a carrier shim kit that comes with an inner/outer piece for the shim pack. I bought a kit from Tom's Differentials (think it was called a Super Pack). I remember that one part was like an open top hat.
I made a large lever to bolt to the pinion flange to help with removing the pinion nut and for tightening it. In my case, the case was on jack stands, so I didn't have the car mass to help me.
You will need an inch-pound torque wrench to set the pinion bearing preload.
You will need a dial indicator to set the backlash.
You will need a tool to determine the pinion depth (there are different types of tools available).
MonzaZ may be able to help.