Brakes are easy....you should be able to easily put on new pads, pull the rotors, and check and repack the wheel bearings. Like an hour job for my 2wd....i would imagine it might be a bit harder for your 4wd, but i'm not sure.
I had a problem once where the brakes would squeal while the truck was moving, but then sometimes they would be quiet after pushing down the brake pedal. A new set of pads solved my problem.
Parts are cheap too....i think it was like $15 for the pads for my truck, $7 each to resurface the rotors, and a few dollars for a can of wheel bearing grease. Remember to replace the grease seals on the rotors too when you have them off....the seals are only about $2 each and will prevent the grease from leaking out or water getting into the wheel bearing assembly.
If you are still a little wary, buy a Hanes or Chilton manual for the truck....they have nice pictures and diagrams of just about every mechanical assembly on the truck....they really help me out alot when i am working on mine
