Do I need any special tools to swap this in?

Standard socket set and basic hand tools will get the job done. You may need a hub removal tool if the old one is stuck, but nothing exotic.

Will this assembly bolt straight to my existing spindle?

Yes — this is a direct replacement assembly. It mounts at the factory attachment points with no modifications needed.

What if the old hub won't come loose?

Spray penetrating oil around the mounting area and let it soak overnight. A hub puller makes removal easier if you have access to one, but it's not required.