Use this guide if your new display assembly comes with the front-facing camera, sensor assembly, and display EMI shield already installed. If this is the case, remove the old display assembly and '''remember to transfer the home button to the new display assembly.'''
If your replacement display does not include those components, you must transfer them to your new front panel as well.
In both cases, the original home button must be transferred onto the new display in order for Touch ID to function.
Opening the iPhone 7 will damage the waterproof seals on the display. If you do not replace the adhesive seals, your phone will function normally, but will no longer be water-resistant.