Having to replace the LCD display I think this guide is missing one more step which is the disassembly of the LCD display from the metal support to which it is attached.
Also as a general rule for all guides in my opinion if a guide is meant to give instruction on how to replace a display for instance it should show instructions showing how the new display must be substituted in place of the existing one and all the way around to completion of reassembly.
Thank you iFixit!
Guide so should be completed all the way around for reassembly.
My iPhone 3GS had some issues with the mute button and on/off switch (not working properly) that I couldn't fix.
Also after reassembly the front metal bazel is not properly adherent as to the real panel as it was in origin.