Do the sensor holes line up with my truck's existing sensors?

The holes are pre-drilled to factory spec. Test-fit the cover before final installation to confirm alignment with your sensors; minor drilling may be needed depending on sensor position.

Can I install this without removing the old bumper?

This is a cover that overlays the existing bumper structure. You'll need to unbolt the old cover or trim and fit this one in its place — full removal isn't always necessary, but you'll need to check your truck's specific setup.

What do I need to do before painting?

The cover arrives primed. Sand with appropriate grit, wipe clean, and apply your finish. If you're using powder coat, confirm the primer bonds well with your chosen process.