Do I need fasteners to mount this, or does it come with bolts?

Hardware is not included with this rail. You'll need the factory fasteners from your vehicle or equivalent metric bolts suited to bumper assembly. Check your service manual or contact your Nissan dealer for the correct bolt specification and torque specs.

Can I install this myself, or does it need a shop?

This is a straightforward bolt-on job if you have basic hand tools and a lift or ramps. Remove the bumper cover, unbolt the old rail, slide the new one into place, and bolt it back. Most DIYers complete it in under an hour once the cover is off.

Does this need paint, or does it come finished?

The rail is unpainted hard panel. If you want it color-matched to your bumper cover, light sanding and primer followed by paint will finish it. Many people leave it unpainted since it sits behind the cover, but the choice is yours depending on your visibility tolerance.