I'd say yes you can do it. You do need a dial indicator like in the below photo, it's used to set the backlash. Even Harbor Freight Tools (usually) has them, it needs to have a magnetic base. You also need a heavy rubber or leather mallet in addition to the tools mentioned in the instructions of the E-Locker at
https://www.eaton.com/content/dam/e...ocker_Installation_Instructions_July_2004.pdf You'll also need to press the new carrier bearings onto the locker which is no big deal. If you don't have a press, not many of us do, nearly any 4x4 or automotive shop will have a press who can press them on for you. I've had to do that before, it's no big deal.
Backlash is nothing more than how far the ring gear can be rotated back & forth which is how much the ring gear teeth can move between the pinion gear teeth. There needs to be enough "slop" between the gears so the gear lube can get in between them. .005-.008 inch is the factory backlash spec but to avoid the need to set the gears up again, you need to measure your present backlash before removing your old Dana 35 carrier and then shim the new locker left or right with shims until it has the same amount of backlash again. That means the R&P gears will continue meshing where they did before the new carrier was installed which is why no gear setup would be required if you get the backlash set the same as before.
However, it's not uncommon for the new locker to produce the same amount of backlash so it's not even assured you'll need to adjust the backlash.
Good luck with it!
View attachment 495662