They're not too bad to do. I did one on my truck when I saw the seal leaking. Figured I might as well replace the bearing too. Take your time and be sure to rent / buy or borrow a bearing puller or slide hammer to get the bearing out.
2001 F150, Black, Shortbed, Regular Cab, 4.2L V6, Auto, 3.55 gears, 4x4
Modified intake and throttle body, 265/75R16 Toyo All Terrains, Spicer greasable U joints & Moog ball joints, Delta toolbox, trans cooler and guage, Magnaflow muffler, Reese Class III hitch.