Like Quack said - quite easy with a jig saw.
I used a spare screen as a template for the edge, pencilled the line along the protective tape then cut just outside it so I could sand back to the line.
Couple of tips - one - the plastic melts as you cut, so make sure the removed part does not stick/weld itself back to the remainder as you cut .
Two - after finishing the cut, put tape along both sides of the screen before sanding the edge I used a foam sanding block and didn't notice my hands curling over the top and scratching the see-through face of the screen! Took ages to polish out the scratches......
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