。
What a hassle.
Literal
Troublesome is [exclamation-な].
The casual exclamation ending な (masculine, self-directed reflection) turns the flat statement into an exasperated 'ugh, what a hassle.' な after a plain predicate is distinct from な as a prenominal link for na-adjectives — here it's purely emphatic, closer to ね but more internal and more masculine-coded.