Anyone can do a good job by replacing every part... The skill is evaluating used parts and making a good call to use or replace.

The bearings on the output shaft that drive the front axle get more trash ( bottom of the case) and are likely to be bad.

Clean and spin each bearing and see how it feels. When I did mine I replaced all the bearings that spun in 2WD and the two that were at the bottom of the case.

The counter shaft bearings were fine. My transfer case had 340,000 miles on it! I got my bearings through the dealer on the internet.

It's not that bad a job... At least compared to setting up diff gears and auto tranny rebuilds.

Have fun!

Kevin C