X is getting under my skin = I'm very frustrated with X, X irritates me greatly. Headache is used metaphorically to mean something that takes too much effort or is too difficult. I don't know what "benchmarking" refers to without context.
I am greatly frustrated with the extra effort/difficulty benchmarking causes me.
The Language Level symbol shows a user's proficiency in the languages they're interested in. Setting your Language Level helps other users provide you with answers that aren't too complex or too simple.
Has difficulty understanding even short answers in this language.
Can ask simple questions and can understand simple answers.
Can ask all types of general questions and can understand longer answers.
Can understand long, complex answers.
This answer was given within 60 minutes of the question being posted.
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