I broke a clip when I did mine, but I think it might've not been fully disengaged. When I had my grill out I swear I remembered that it seemed best to relieve the tabs from the back, or that it has to be done that way.
The grill is really easy to take off as well. The only trick with reinstallation is to make sure all of the lower tabs on the grill grab the top of the bumper cover. This ties everything in as fragile as the parts may seem.