I was impressed by her 'skill' at writing. = I was impressed by her 'skill' as a writer.
The work is difficult and requires a lot of 'skill'.
Poker is a game of luck and 'skill'.
(..) Back,you devils! Frodo! Oh,Sam. Strider! -Help him,Strider. -He's been stabbed by a Morgul blade. This is beyond my skill to heal. He needs Elvish medicine. Hurry! We're six days from Rivendell! He'll never make it! Hold on,Frodo. Gandalf! Look,Frodo. It's Mr. Bilbo's trolls. (..)2001 The Lord of the Rings: The Fellowship of the Ring