Scrape all adhesive residue from the frame surface. Use high concentration (over 90%) isopropyl alcohol to help. A replacement screen attached to an uneven surface will crack.

Use an opening tool to carefully scrape the adhesive off the capacitive button surfaces.

Connect your new screen by threading the display cable through the cutout and connecting it to the phone. Power on your phone and test it before re-adhering the screen.

Do not forget to replace the Home button during reinstallation.

Keep the replacement screen connected to the phone during the re-adhering process to help align the screen properly.

Be sure to peel all adhesive plastic liners on the replacement screen when re-adhering the screen.