Will this work if my bumper has fog light cutouts from the factory?

The K-1 bumper is a complete new fascia, so the fog light openings may differ from your OEM layout. You'll need to verify the hole locations match your lights before painting, or be prepared to carefully cut or fill as needed.

Does the lower valance attach to this bumper, or is it sold separately?

This bumper cover is the main fascia only. Lower valance pieces are typically sold separately. Confirm fitment of any valance accessories with your specific model year before ordering.

Should I paint this before installing, or after bolting it on?

Most builders paint off the car for easier coverage and handling. Since this Requires Surface Prep, you can prep, prime, and paint it in a controlled environment, then install the finished piece.