Damn! This is complicated with no guarantee of success (3-3-4)
I believe the answer is:
hit-and-miss
'with no guarantee of success' is the definition.
(I've seen this before)
'damn this is complicated' is the wordplay.
'complicated' indicates anagramming the letters (a complex or confusing ordering of the letters).
'damn'+'this'+'is'='damnthisis'
'damnthisis' with letters rearranged gives 'HIT-AND-MISS'.
(Other definitions for hit-and-miss that I've seen before include "Inconsistent" , "Haphazard" .)