as long as your dps is competent, playing tanks and healers isnt very hard. you can keep aggro with taunt mash and every dps class has a built in threat reduction. if they dont use it, thats their own fault.
the biggest cause of wipes in operations is DPS failing the enrage timer race.
dont be afraid to heal or tank. best place to learn how to do both is in warzones.
youll get good at target switching, managing cooldowns, and utilizing taunt in no time and all healing takes is paying attention to when you are going to encounter large periods of burst and saving your cooldowns for it.