This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. The とう goes to どう, though. Agh, what a 面倒.
I never once thought they'd given me troublesome tasks.
You've taken on such a difficult job!
Mark my words. That Fugu boy is going to cause trouble.