Others have noted that removing the battery is a lot easier (and safer!) using dental floss

Be careful with removing adhesive around the NFC Antenna/Charging Coil Assembly. It’s covered in a black wrapping that can look like adhesive. Don’t scratch too hard with the spudger, the wrapping will come off!

The replacement back glass could use some more adhesive towards the top and bottom. It doesn’t sit as well as it should. Definitely no longer waterproof

Peter has it right, after you confirm it’s the right one for your phone just cut it in two. You can also peel off the clear plastic backing and put it back on, but only on one side. That way one side is protected while you deal with the other.

Agree with what Damien said. If you have the screen off, it’s much easier to remove the battery from the other side (screen side). Just use the iOpener directly on the adhesive and slide a pick in very carefully. Seems like the floss tip is pretty useful, wish I had read this beforehand!

I said it on an earlier step, but worth mentioning here. This is the hardest part of this guide. Be careful to push the spudger towards the body of the phone (away from the screen side) to avoid hitting the digitizer film (orange). It’s pretty easy to slide the spudger if you’re underneath the digitizer film, but gets pretty hard if you’ve hit it.

This is the hardest part of this guide. Be careful to push the spudger towards the body of the phone (away from the screen side) to avoid hitting the digitizer film (orange). It’s pretty easy to slide the spudger if you’re underneath the digitizer film, but gets pretty hard if you’ve hit it.

Be careful with the NFC Antenna/Charging Coil Assembly. It’s covered in a black wrapping that can look like adhesive. Don’t scratch too hard with the spudger, the wrapping will come off!

Go clockwise (or counter-clockwise) around the border to avoid causing extra stress on the back. The bottom has a lot more adhesive than you think, towards the top-center.

Best video I’ve seen of the S8 teardown. Agree with what Andrew said above, check the midframe to see all the extra small parts are there. To check everything works, you can turn on the phone with after connecting the display to the motherboard, and puting the internals back together (everything but gluing the front and back pieces). Be careful to put all the screws back in place- the motherboard needs a tight connection to components on the midframe (like the power button and audio speaker) to work. Good luck!