Tank preperation in HW

I'm just curious what everyone's opinion is on going in cold or learning about these new trials and dungeons ahead of time. As a newer player I made it a point to go back and read and watch a video before any new dungeon I went into which was basically off of them since I only started playing about 3 months ago. I figured with all the content being older it would be expected of me to know those fights especially since for dungeons people wanted to get in and out for their relics. Now however I would like to experience all the new content the way it's meant to be experienced, but is that expecting too much in the youtube age? So far I'm 53 and did Dusk Vigil and Ravana cold no knowledge, prep reading, video watching etc and things went fine. Most of the other players were first timers as expected and we just kind of winged it. It was quite a lot of fun not worrying about a mistake because I didn't know what to expect and just react as best as possible. I'm kind of thinking this is like tv and movie spoilers it's cool to be in the dark for a bit, but at a certain point don't be surprised if someone blows the ending or gives you crap for not knowing what to do in this case.
So what does everyone think, prep or no prep for newer content? Are tanks held to a higher standard of knowledge and expected to give up some immersion into the game because of it? Also is there a cutoff for when knowledge of a fight is expected?

There isn't really much you can prep for with the new content. The guides that are out there are few and not necessarily reliable. With so much content to digest, the major guide-makers aren't able to produce guides in mere days like they can with regular patches.

This is the time to enjoy not needing to know everything in advance. When I enter I'll usually type a quick greeting of "Hello! This is my first time running this dungeon so I'm going to keep pulls restricted to 1 or 2 packs at a time" and go from there. When we get to bosses I will stand inside the ring and wait for just a few seconds to see if anyone types things they want me to know for the fight. So far no one has and I've gone 1/1 on every boss encounter. I'm currently through the level 55 dungeon and I have had no problems with these methods yet. Only the rarest of jackasses gives people a hard time about not knowing everything when it's a full blown expansion that's under a week old.

Basically my thoughts as well, though I did look and 2 of the big You Tube names already have pretty much everything including the extremes.

Depends on content, for new casual content (ie Main Story Stuff), I don't mind going in blind and figuring it out myself. But when I did Endgame / Hardcore stuff like Coil I would would watch the videos and stuff to get a general idea.