Here's a step-by-step video tutorial that shows you how to replace screen glass "only" on the Galaxy S4 Android smartphone. It took me around an hour to do this and LOTS of patience. It can be done if you do it carefully and slowly.
Timeline 1:38 Beginning of Glass replacement 3:15 The first gap 4:30 more gaps 5:51 adhesive slowly coming off 7:48 More adhesive coming off 10:37 Pulling on Suction cup 10:49 Glass comes off! 14:30 Replace with new Glass 17:00 Glass replacement successful with white Home button on Black Glass!