Viel scissors sharpening question

[Bud]

I wish that someone would explain to me the secret of sharpening scissors. I'm just talking about ordinary cheap kitchen shears and not the kind my barber uses. Every time I sharpen scissors they come out no better than when I started. I don't use a clamp but try to freehand them matching the original angle then remove the burr. I can sharpen a knife but scissors seem to be  are over my head.