Do I need to remove the front bumper to install this?

Depends on your access space. Most installs work with the bumper in place since this bolts at the lower fascia. If you're working in tight quarters, dropping the bumper gives you more elbow room, but it's not required.

Can I paint this before installing it?

Absolutely. Paint it off the vehicle if you want a clean finish without masking. Just make sure paint is fully cured before bolting it down to avoid adhesion issues at mounting points.

What fasteners do I need?

Hardware is not included with this valance. Use OEM bolts from your existing bumper assembly or sourced separately—your vehicle's service manual or dealership parts diagram will list the correct spec and torque values.