The grille is just held on by clips.
This will help you identify the clips and how to release them:
Also, for the grille-On the bottom of the grill there are 4 tabs going through the bumper cover that have to be pressed to release the lower part of the grill, while the clips hold the top. Another great expert reminded me of these.
Not sure if you need front bumper procedure or not, but here it is as well: