Here's some shots I took when I finally did mine...
Before. (you can see the peach fuzz of the tire rubbing away on the valence. lol)
I even did the back of the flare where it's closest to being hit by the tire...
Tool of choice:
Then to smooth them off, just a couple quick swipes of emry cloth or sandpaper and you're done.
I don't have any good before pics, you're just gonna have to look at your truck. 04+ guys need to cut away more material because the valence is so squared off in the area that needs trimming.