Do I need to replace both sides at the same time?

Bearings wear at different rates depending on driving and alignment. If one side is making noise or has play, the other may still be serviceable. Inspect both before deciding to buy pairs.

What tools do I need to install this?

You'll need a socket set, brake tools to remove the caliper, and a hub puller or press to separate the old assembly. Some shops use a slide hammer. Check your service manual for the exact sequence and torque specs for your model year.

Can I reuse the axle nut and bolts?

Axle nuts are typically single-use — they're designed to be torqued once and should be replaced. Check your manual for torque value. Mounting bolts can usually be reused if they're not stripped or damaged.