Rear wheel bearings are nowhere close to the fronts. You need to remove the large axle nut (200+ ft lbs), and then usually a special tool is needed to pull the old bearing out of the wheel carrier/hub. And then another to press the new bearing in straight.
If mine ever go bad, I am taking it to a shop. Or maybe buying new wheel carrier hubs and having the bearings pressed in outside the car, then just swap out wheel carriers. If yours are not noisy yet, I would leave them alone, honestly. I would spend the $$ and time on something else. Just thinking about the job makes me shudder.
