Replacing the parts is the easy part, if you don't have any damage underneath the parts, example, on my son's Toyota pick up truck, we had front bumper, headlight, headlight brackets, front fender,and grille, we removed everything off the truck, replace the bumper with new, straightened out the bump braces. Install the fender,, almost,, seems as though the headlight was the point of impact, and it was so messed up that we could not get the headlight back into position, could not even install it none of the bolts would fit,,,
we then took it to a body shop,, we then took it to a second bodyshop, now were on our way to a third bodyshop, because none of them wanted to install the parts that we bought because they were not genuine Toyota, and they said the fit will not be what we want when they get through, we did finally find a bodyshop that would install our parts, at more money than if you bought the part to begin with, we had the truck fixed and sold it. And no the parts did not fit like OEM parts. Very close though. jim

ps if you are going to a bodyshop let them buy the parts, then they are responsible for the fit and the way the vehicle looks just finished.