Not to hard,but can turn into a nightmare quick.
You need a 35mm socket,a E12(or E14 socket,can't remember off hand) for the 3 unit bearing bolts,a 12mm socket(calipers),and a 21mm socket for the caliper mounts.This just the basic tool list.
You need to take the wheel off,take the 35mm axle nut off(have another person step on brake pedal for this).Remove the brake caliper and then it's mount,remove rotor.Remove the 3 "E" Torx bolts on the back side of the unit bearing,and remove the bearing.This is where it can be fun as corrosion can seize the CV stub shaft into the unit bearing and the unit bearing in the knuckle.A special hub puller comes in handy for this.Install is the reverse,the axle nut is torqued to 100 lbs-ft.
Get Timkin unit bearing,will cost more is you have ABS.$700 for a shop to do it is pretty cheap.
'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case