I agree with grabbing the fender at the bottom corner next to the head light and just pulling it back out. You have to go a little past the original position because of spring back, but not much. Take it easy, you can always pull it just a tad more on a second or third pull.
The bumper cover is a different story. If you look under the car, there may be holes in the fender and the bumper cover where you can use those plastic push pins you get at the parts place to pin them back together. Those will be at the very back of the bumper cover and the front of the fender. Clip the rest of the bumper cover first.
If the hole in the bumper cover for the push pin is torn out, (very likely), you could use a nut, bolt and two fender washers and a lock washer to secure the end of the bumper cover.