fussy about small details; fastidious
"I have seen the most reluctant and persnickety buyers change before my eyes when they at last encounter the Perfect House. It's downright touching." Felicia Stidham, TheGeorgetownDish.com, February 13, 2011
About the word:
Persnickety is an alteration of the older (and more insulting) pernickety, which may itself be an alteration of particular.