Installed a kit on my '05 yesterday. Took about 5 hours working by myself, probably would've helped to have another set of hands.
The kit went together fine, the hardest part is screwing around with pop-its, the most time-consuming part is taking the bumper on and off and making slight adjustments to get everything lined up correctly. My core is centered, but slightly tilted. I'll mess with it more when I take the bumper off again to cut out that vertical piece in the opening.