The last step is to push the cracked camera lens out from inside.

First, find a tool you prefer and easy to use with effort. Then, put your hands where your power will land to protect the rear case from bending. Next, push the camera lens with effort. Please be careful with the phone and your hand very much.

When you place the new camera lens, you will need glue or adhesive to fasten the camera lens as well as the new bottom bracket.

You don't have to have a new bracket, its not necessary.

If you worry about the iPhone 7 Plus being damaged, please send it to an Apple center.

What I do here is that I put the phone firmly at the table with the camera sticking out, I place my flat screwdriver where the red marker is and I slightly tap the screwdriver with a hammer.