Will this lip interfere with my factory bumper or parking sensors?

The lip mounts to the factory valance using existing hole locations, so it sits flush without interference. If your vehicle has sensors in the lower bumper area, verify clearance by comparing your OEM bumper profile to the lip extension before final installation.

Can I install this myself, or do I need a shop?

This bolts to factory mounting points with basic hand tools. If you're comfortable removing your lower bumper trim and aligning bolt holes, you can do it at home. A second person makes alignment easier but isn't required.

What prep work does the lip need before painting?

Sand the primer surface with 180–220 grit to scuff and open the grain, wipe clean with a tack cloth, and apply your basecoat and clearcoat system. No epoxy primer or filler is required unless you're filling minor voids—the FRP arrives ready for direct coating.