I've always cut plasterboard by scoring with a Stanley blade and knocking it open with my knee. Then cut the back paper with the knife again.
big cuts yes, done a lot of fiddly scribed window reveal stuff that’s an interference fit so knife/knee needs an upgrade.
@Mr_Smyth started
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I've always cut plasterboard by scoring with a Stanley blade and knocking it open with my knee. Then cut the back paper with the knife again.