Do I need to tap into the main electrical harness?

No. The integrated switch operates as a standalone circuit, so you're only running wires to the battery and ground. No splicing into existing headlight wiring.

Will this bolt directly to the bumper, or does the bezel need modification?

Designed to mount at factory points—the bezel installs where the blanks currently sit. Test-fit before final fastening to confirm alignment with your bumper.

What if a bulb burns out down the road?

H11 is a common automotive bulb; you can grab a replacement at any auto parts store for under $10. They're plug-and-play—no tools needed.