I've become a big fan of cheap EMT shear type scissors. They are widely available and there are super affordable versions if you steer away from the more "tacticool" versions. As a pair of beater scissors they are great and will cut a wide variety of materials. I often use them to trim the edges of cured fibreglass layups etc and they really are tough. Just make sure you don't take them from a first aid kit you may rely on!