Will this plug directly into my factory wiring?

Yes — this is an OEM part with factory connectors. It connects to your existing mirror control switches and wiring harness without adapters or splicing.

Does the heater function work right away, or does it need any setup?

Heating activates through your factory rear defroster button once the mirror is installed and wired. No configuration needed.

What tools do I need to swap this in?

Basic hand tools — you'll need a trim panel removal tool to access the mounting bolts inside the door, plus a Phillips head screwdriver. The actual swap takes about 15 minutes.