I can only speak for big upholstery type scissors.  These are fairly easy
to sharpen with a regular triangular saw file,
-as someone already mentioned, don't take them apart,
-clamp a side in an appropriate vise, then draw file the narrow face with
nice even strokes
  The small Burr on the wide faces comes off with first use, (as already
mentioned, don't need to risk stoning it).
It's really not that difficult to do.
Cheers
Claudio