Builder: There is a huge difference between doing the front vs. the rear bearings. The backs can be done in about 1/2 hour per side. (Disk brakes) The hub and bearing are replaced together and no special tools are needed, except a 32 MM axle nut socket. The front beargings are a whole different story, and you have to remove the steering knucle to have the hub & bearing pressed out & back in at a machine shop. (Some NAPA stores have the bearing and machine shop services.) The fronts take several hours per side and you'll need a large puller to get the steering knuckle/hub off the drive axle. (A haynes manual is adequate for directions...)