I completed this repair on this iPhone 8 Plus after I damaged the cameras myself. I managed to succeed in chipping off all of the back glass panel of the phone successfully. Removing this shattered panel was the hardest iPhone repair job I have ever done. At the very end, I attempted to wiggle off the metal housing over the cameras that was originally part of the back glass. After removing this housing, I discovered that I had damaged both cameras. In retrospect I should have removed the cameras from the inside of the phone before prying off this housing.

The back glass removal is the most impossible task for this phone and should be attempted only by crazy people with an appetite for pain. I will document with a “repair story.” —CW

As the other comments say, you have to be very careful about removing the secondary (top) mic at the same time as the headphone jack. The secondary mic is tethered very tight to the jack with a flex at the very top of the phone housing, and it is easy to break this connection. This is important to pay attention to if you are following this guide in an attempt to move the headphone jack out of the way for another repair.

Be careful "pushing aside" the headphone jack! I wanted good access to the upper-right display screw so I attempted to move the jack. It is not easy to tell that the jack is tethered to the secondary mic which is visible just to the left of the jack in the photo. The secondary mic needs to be removed at the same time as the jack. I broke the secondary mic off, and then needed to replace the headphone jack/secondary mic/volume button/mute button flex, which is an even harder repair!

My phone was too shattered to grip with my "Pump'itup" iFixit suction cup, and the method of adding packing tape over the display did not work either (still too lumpy). I ended up epoxying two 5" x 3/4" pieces of wood trim strips directly to the face of the phone, avoiding the Home switch and any seams, and positioning the wood to overhang the phone by ~2 inches. After 30 minutes of setting, I was able to lift up on the overhanging wood strips and pop the face of the phone out of the housing.

I found that I had to remove the 6 side screws and washers completely, because the new front tabs were bent inwards. To reinstall them all, I supported each screw on the up-facing tip of a magnetic screwdriver, then I placed the washer onto the screw with a tweezers, and then I inserted the screw upwards into its hole, never changing the orientation of the screwdriver.