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Front: easy, rear: less easy.
I assume you refer to the front. If greased properly they don't need replacing, just adjusting and maybe repacking. A car with 300K maybe, 122K: repack and will be fine for a few years.
Puller is not required. For front just remove brake caliper and shaft nut. hub will fall in you hands. Now if the grease is gone, baring is brown (rust) of blue (overheat) you have a problem and need to renew the bearing. The bearing can be tapped out of the hub carefully, not a big deal. You would have noticed that anyway by accessive bearing noise. These things don't go wrong very ofter, stop worrying!
Repack with proper grease, and as you have the lot off, replace the seal on the inside side of the hub. Make sure you have the orientation right (no grease out, no dirt in).
Put together and hand tight the shaft nut, don't forget the pin or else your wheels will be overtaking you!.
Have fun,
Jorn
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