Will this plug directly into my Journey without modifications?

Yes — this is a direct OEM replacement that uses the factory mounting location and connector. No wiring changes needed.

Do I need to remove anything else to install this?

You'll be removing the factory third brake light and swapping in this LED unit at the same mounting point. A basic socket set is all you need.

How long do LED brake lights typically last?

LEDs run much longer than incandescent bulbs — you're looking at years of service before any fade or failure, depending on driving habits.