If it is a 2wd model, the bearings are in the hub/rotor assembly. If the brakes need to be changed soon it would be better to do it now and change the rotors/pads. If the rotor/brakes are good, you would need to remove the brakes/rotor, remove the bearing seals/bearings. Grease the new bearings, install new seals and reassemble the brakes, axle nut torque spec is 400nm(296ft-lbs).
A 4x4 model is more complicated, needing to also remove the knuckle/spline from the A-arm to remove the front axle from it. Also have to disconnect/remove wheel speed sensor/wire. The bearing comes complete with the hub assembly that get bolted to the knuckle/spline.
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