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Tungsten carbide knife sharpeners are really easy to use. Simply put the sharpener on the blade and pull it towards you.
Tungsten carbide is really effective at rehabilitating a worn out edge – one that is really blunt and lost its cutting angle.
If you use one regularly you need to only use it gently otherwise the blade will wear away.
I always start sharpening with one of these (or similar) and then hone the edge with a diamond or ceramic steel or hone.
This one is an inexpensive model but should last a long time if not handled roughly.