Will these skirts block access to my jack points?

No. The MS-R design maintains clearance along the rocker line for factory jack point access. Verify your vehicle's jack point location before final installation to ensure adequate working space.

Should I paint these before or after installation?

Either approach works. Many builders prefer to paint off-vehicle for better coverage and finish control, then install. If you paint installed, mask adjacent panels carefully. Sand and prep the primer surface before applying your chosen topcoat.

Do these bolt directly to the factory rocker or do they need custom brackets?

They're designed to work with factory rocker mounting points. Reference your vehicle's original rocker attachment holes and prepare fastening hardware appropriate for FRP panel mounting. Your service manual will confirm point locations.