Do I need to remove the bumper or fender to install this?

Access depends on your model year and trim. Check your service manual for the specific removal procedure. Most owners handle removal and install with basic hand tools in under an hour.

Will I need a new bulb, or does this come with one?

The assembly houses the bulb but doesn't include a halogen bulb. You'll need to source a compatible bulb separately and install it into the housing before mounting.

What if the headlight doesn't seal properly or moisture gets inside?

Test-fit the assembly first and confirm all tabs and mounting points align. If you notice gaps after installation, check that fasteners are fully seated. Contact support if there's a defect in construction.