Basic cutting is a skill. Get the right tools - cutting mat, metal ruler and a sharp craft knife. The Grey card needs to be cut in layers, cut a light groove as a guide and then follow this with subsequent cuts. Do not press too hard or try to cut through in a single attempt - this leads to shoddy cutting, slips and accidents!
Cutting directly on tables ruins your knife, the tables and again makes slips more likely. Ensure fingers are well away from the blade at all times and not over the edge of the ruler!
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