93 Dodge Dakota 8.25 Gear Swap
I swapped the 3.07s for 3.55s in the 8.25 in my Jeep, later I did the opposite swap for an 8.25 I swapped into an M-body. It is MUCH easier with the axle assembly out of the vehicle but the basics are the same as an 8.75".
I made a side-thrust adjusting tool by welding a big hex nut to a deep 1" socket then just used some long socket extensions to get it down the axle tube.
IMO if you have the money it might be worth having a shop do it unless you have a lift and lots of time to spare.