I actually don't find healing stressful, but I've been doing it for a long time. Fortunately I was able to learn with guild groups that were much more forgiving than randos might have been. I find tanking the most intimidating role by far and didn't even attempt it until I'd been playing MMOs for years, so I'm impressed that you're willing to go for it!
"You could have watched a video/read a guide" is also a common retort in WoW when people say they're new or don't know things. Which... I guess I have a certain perspective on, because I used to be a raid leader for pretty high-level content, and I did do that 'homework' of making sure I understood the fights before we even zoned in -- because if someone else didn't understand, I was the one they were going to ask for help! And sometimes the mechanics are truly complex and can't be summed up in a few words, and are hard enough to execute even if you know exactly what to do, such that most people would not have the time or the patience to learn solely through trial and error.
BUT when you're talking about basic dungeon content that is tuned for random groups to be able to complete in 20 minutes, you're not going to have that level of complexity. At that level, most things really can be explained in a sentence if you know the fights. And not only do I find it disappointing that many people aren't willing to do that, I also think it is silly that anyone would go in with the expectation that others should have done the level of research that high-end raiders would do when it's so far from being necessary, and may actually be counterproductive. (Dungeon bosses typically do a lot of Stuff that is intuitive or low-impact enough not to bother explaining, with maybe one crucial thing that you have to get right, so comprehensive guides can actually obscure the most useful part of the information, IME.)
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"You could have watched a video/read a guide" is also a common retort in WoW when people say they're new or don't know things. Which... I guess I have a certain perspective on, because I used to be a raid leader for pretty high-level content, and I did do that 'homework' of making sure I understood the fights before we even zoned in -- because if someone else didn't understand, I was the one they were going to ask for help! And sometimes the mechanics are truly complex and can't be summed up in a few words, and are hard enough to execute even if you know exactly what to do, such that most people would not have the time or the patience to learn solely through trial and error.
BUT when you're talking about basic dungeon content that is tuned for random groups to be able to complete in 20 minutes, you're not going to have that level of complexity. At that level, most things really can be explained in a sentence if you know the fights. And not only do I find it disappointing that many people aren't willing to do that, I also think it is silly that anyone would go in with the expectation that others should have done the level of research that high-end raiders would do when it's so far from being necessary, and may actually be counterproductive. (Dungeon bosses typically do a lot of Stuff that is intuitive or low-impact enough not to bother explaining, with maybe one crucial thing that you have to get right, so comprehensive guides can actually obscure the most useful part of the information, IME.)