its an easy job, take the wheel and brake drum off, remove the drive flange undo the outer bearing nut, (52mm box spanner) remove the lock washer, remover the inner nut, pull the hub off the stub axle, pop the old seal out while your there inspect the bearing for dirt, play and noise/roughness if it looks and feels ok grease it up,slap it back together in reverse order to removal, when tightening the bearings i normaly do the up tight with a short bar in the box spanner then back them off a bit