Two healers can out-sustain your burst - Fear one healer to reduce incoming heals before committing the full Rogue burst.
Whoever lands the first full CC chain on the enemy DPS usually wins - Cheap Shot through any Fear attempt rather than waiting it out.
Kiting casters buy time against your melee - root the Mage specifically to let the Rogue close.
Whoever lands Cheap Shot on the enemy DPS while their own Fear is up usually opens the fight's decisive burst window.