Gently remove the main circuit board.

Keep in mind there are some ribbon cable connectors underneath the board. These should pop off easily, or you can use the opening tool to gently remove them once you have the board lifted up a bit. Also be mindful that these get reconnected with you put everything back together!

Power button cable.

Earphone cable.

The main circuit board also is connected to the main camera and the front facing camera with more ribbon cables. These should stay attached, but be delicate. You don't want to get dust in them when you seal everything back up!