The two easiest methods involve using sand paper or aluminum foil:
With the sandpaper: use a relatively fine 150 or 200 grit sandpaper, cut with the rought side down.
With the aluminum foil: take a nice sized sheet of aluminum foil and fold it a few times to get it nice and thick. Now cut thin strips of the aluminum foil with the scissors. Simple.
You can also sharpen scissors with a glass bottle. Stick one side down in the neck of the bottle and close the scissors. It will force the scissors up and out. Do it a few times and sharp again. A friend from a third world country taught me this trick.
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