not very hard, just sand, clean with thinner, prime, clean again, paint, clear coat. i used duplicolor spray on the grille and spray can clear coat. the bumper i used "real" canned paint, $60 a pint!!! wholesale!!!! expensive red!!!! and epoxy primer, and polyurathane clearcoat.... the $60 paint was not even a close match, i called "colours" where i bought it and they said it was because i didnt buy the $150 a pint paint, the cheap one is not a perfect match, but they would cut me a deal on the expensive one. thanks ya jerks!!!! i wish i used duplicolor, way better match.