This was the most difficult step for me. For some reason the screw of one grounding clips is stuck. It just kept spinning and spinning in place. I couldn’t find a thin enough object to go under the screw head to wedge it out. I even tried a razor blade, much to my terror. In the end i just left it there and reassembled my phone with just one grounding clip. I don’t know how important that thing is and if it will affect my phone. But it’s been a couple of hours and my phone seems to work fine. Wifi and data reception didn’t suffer. I don’t know about calls yet. I guess we’ll see.