You cut thin lexan with the sticky plastic backing still on it. If it's off, put duct tape on both sides of the cut.
Use a jigsaw with a fine toothed blade if youre cutting shapes.
For a straight cut use a circular saw with a very fine blade (like the type to cut particle board and melamine).
Make sure not to twist the blade and keep it perfectly perpendicular as lexan will shatter.
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Not to forget the score and break method if they dont have access to power tools.
This is a fairly comprehensive guide to working with Lexan:http://www.theplasticshop.co.uk/plastic_technical_data_sheets/lexan_polycarbonate_sheet_processing_guide.pdfL