Finicky
/ˈfɪnɪki/
adjective
(of a person) Fastidious and fussy; difficult to please; exacting, especially about details.
“My editor is very finicky about punctuation. Every dot and comma has to be just right.”
Demanding; requiring above-normal care.
“The lawnmower is a bit finicky in cold weather.”
Synonyms: fastidious, fussy