Will this plug directly into my car's wiring?

Yes. This is factory equipment with the OEM harness included, so it connects straight to the existing mirror circuit on your Accent. No adapters or rewiring needed.

What's the difference between this and a manual mirror?

This mirror folds in and out electrically via a dash button or key-fob command. A manual mirror has no power fold—you'd fold it by hand. If your car came with power-folding mirrors, this is the direct replacement.

Do I need to do anything before installing it?

Disconnect your battery before removing the old mirror and installing this one. Beyond that, it's a straight swap—align the mounting points and reconnect the harness. No modifications required.