Do I need any special tools to install this?

Basic hand tools and a socket set are sufficient for most installs. You may need a hub puller if the old assembly is seized. Refer to your vehicle's service manual for torque specifications and detailed steps.

Is this a complete assembly or just the bearing?

This is a complete hub and bearing assembly — everything you need arrives pre-assembled. You won't need to buy races, seals, or additional components separately.

Can I install just one side, or do both need to go in together?

You can install them individually, but best practice is to replace both sides at the same time for balanced wear and handling. The kit includes both sides for that reason.