I have a pair of large, sturdy scissors of unknown origin that are in good condition. They work well. The part about being sturdy and in good condition is important. The cheap scissors you pick up at the store these days are not reliable enough, and, sooner or later, they will tear up rather than cut one of your film rolls. A sewing store may have a better choice. Make sure the blades are sturdy and that they are held firmly in place. You want scissors that are large enough to make a single cut across the film, otherwise you will get an uneven edge that catches on things. Surgical scissors are excellent for 35 mm, but they are too short for 120.