Remove all of the old double-sided tape and with it any remaining pieces of glass. Apply a new layer of double-sided tape to the frame, remembering to keep the front facing camera and the proximity sensor unobstructed.

Remove the front speaker protective grill from the old screen assembly and make sure to place it in your new part.

You will not need to remove anything else from the old front panel assembly.

Remove the protective cover and fit the new front panel into place, routing the flex cables through the gaps, making sure they are not bent or stuck in any way.

When reassembling, to prevent problems with the touchscreen, add a piece of tape on the digitizer cable. This prevents the digitizer flex from making contact with the motherboard. (Thanks to Maxim Trofimov for this tip)