Do I need to remove the door panel to install these?

Yes. Both the motor and regulator mount inside the door cavity, so panel removal is required for access. Plan for basic hand tools and a panel removal kit to avoid damage during disassembly.

Will this assembly work if only one window is broken?

This is a two-side set, so you're buying both driver and passenger assemblies together. If only one side is damaged, you can install just the side you need and save the other for future use.

Does this come with mounting hardware and connectors?

The assembly arrives ready to bolt into place at the factory mounting points inside the door. Verify all connectors match your vehicle's harness before final installation—some vehicles may have different plug configurations.