Hmmm, not easy, Matthew. How about...
accurate, detailed, distinct, especial, individual, meticulous, precise, scrupulous, selective, singular, special, thorough, notable, exceptional, unique, unusual, stickler, formalist, idealist, purist, challenging, ambitious
as opposed to:
backbreaker, bothersome, clamorous, critical, dictatorial, difficult, exacting, exhausting, exigent, fussy, grievous, hard, imperious, importunate, insistent, nagging, onerous, oppressive, pressing, querulous, strict, stringent, taxing, tough, troublesome, trying, wearing, weighty,
Side bar . . .
I work well with "difficult" actors/directors/designers/producers.
I want to find a word in the English language - that is demanding, perfectionist, particular, etc . . . but without the negative connotation - it would be so helpful in this biz.