I just put this in my 93 and it was my first as well. Nothing to it. Keep everything clean and follow the instructions and you should be fine. As for the needle bearings I think that I had to remove them for the YJ. I don't remember now but the instructions are very clear. Grab a 12-pack and have at it.
93 Wrangler YJ 4.0 Automatic Full Width D44 Front With Detroit Locker, 9" Ford Rear With Spool, 5.13 Yukon Gears, Advance Adapters SYE, Tom Woods Rear Shaft, SOA with Rustys 3.5" Springs, 4 Wheel Discs, Warn Premium Hubs, 12.5x36 TSL's on Black Crawler Wheels, Warn M8000 Winch, Homemade Flat Fenders, M.O.R.E. Track Bar
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Daily driver-2005 Dodge Quad Cab 2500 Cummins 6spd. 4x4, Edge/Attitude, Fresh air by AFE, Exiting through MBRP, Ranchhand Front Bumper, 12.50x33x17 Mickey Thompson MTZ