Oh yeah BIGGEST tip, use FOCUS TARGET! This lets you focus target the boss and keep their HP open all the time, seeing their attacks while targeting the tank etc. I remember before I healed we did one dungeon and the Healer kept wiping because she was like I have no idea when the boss is casting Final Curtain or whatever it is, since she was targeting the tank. That's what Focus Target is for, you'll want to focus target the boss at the start of every fight so you can be ready for those big attacks you see coming.