differental pinion bearing replace

Hey,
What is the easiest way to replace the pinion bearing? I hope I don't have to take the axel out of the car.
The repair shop wants $450 + parts. I'll do it myself.
Any tips would be GREAT!!!!

Thank's
Birdboy

too many adjustments needed for a do ityourselfer pinion depth backlash and crush collar to set preload.unless you have a lift forget it you are just asking for trouble. believe me gm master tech 18years.