Do the front next! Screw safety. I had overlays on my headlights for the longest time and I could still see fine at night. I had them until I moved to Germany and I had to take them off to pass their inspection, along with the tint I had on my front 3 windows. There's a company in Italy that makes smart glass for cars so I'll get those put on the car before I leave here so I can still have tint on my windows.