To take the clips off:
If they are the style where there is 2 pieces, get a small flathead screwdriver and try to pry the center section out from the clip and then pry on the 2nd piece of the clip that sits flush to the bumper.
If it is a one piece clip the "christmas tree type" with just a round cap on it, try using a tack puller or the "claw" end of a hammer.