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Get a piece of fishing line or similar tough cord and pull it along the back in a see-saw motion - this usually breaks the bond of most No. plate adhesives.
If you are going to stick the new ones back on you'll need to ensure the old adhesive is removed other wise the new ones could fall off.
As a matter of interest where did you buy the new plates
Currently in madnoel10's garage:
Honda Civic 1.4l