The quality of being fiddly; complicated awkwardness.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "fiddliness" in a sentence
"It has to do with the fiddliness of the 3. 5e minis rules."
"I have discovered that for me, fiddliness in hot chocolate is not any kind of flaw, but rather a virtue: I like messing with the whisk and more than one measure and having multiple steps."
"I always think it's harder than it is, but once I start making them, I always wonder what my mental hangup is about them - probably the fiddliness of making the ridges (altho that isn't even mandatory)."