I used a hair dryer, not a heat gun. If you can't hold the screen with the hot air blowing on your hand then reduce the heat, lower fan speed, or move the hair dryer a little farther away. If you can stand the heat you probably won't melt the plastic.
Make sure you have a nice brightly lit work space. Especially try to minimize any shadows so you can easily see the tiny screws and connectors.
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Here's a preview of what the graph will look like:
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