For most content, I just run it blind to be honest.
Don't stand in the bad stuff. Stack on the big, shiny, noisy stack marker. Be number 1/2 on enmity. Don't run into the edge of the arena because you'll fall to your death/be vapourized.
Uhh... That's pretty much every encounter in a nutshell.
Sometimes it can be nice to watch a video just to see the occasional mechanic that might catch you out (Notably, E7 with the birbs and portals seems to make way too many people fail).
Though, for EX/Savage/Ultimate you'd probably want to put together a blind run PF group. Shouldn't be too difficult, heck I've been able to sign up to blind runs of EX trials on BLU and there's all of like 3 people who actually use that job!
