it is not easy! follow the advice of Excessive! I never put the clamps on the phone and I have never run a repair with the glass facing the heater ..
I separate the glass always with his face upwards and to anchor it to the machine I built the templates in copper and pliers attach the template to the plate.
COPPER.jpg
1-remove glass = 10 min
2-remove glue and clean = 1 hour
3-put glue and new glass = 12 min
4-uv lamp and finally cleaning = 30 min