finicky

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.

She has a finicky baby that's hard to feed.

Demanding; requiring above-normal care.

The lawnmower is a bit finicky in cold weather.

Instead of Rose Levy Beranbaum’s Cream Cheese Pie Crust from her addictingly finicky The Pie and Pastry Bible, I decided to make her Sour Cream Crust.