Look, maybe it's you. If you see a paladin in the video and you don't know what to do because you're a warrior, it's not the game. It's not the class. It's not the encounter. It's you.
And no, tanking's not hard. You survive, you did a good job. You die, it was either your gear or your healers. Tanking involves very little skill nowadays. You've got a handful of cooldowns you use every couple minutes, and that's about it. DPS has to manage more at once, and healing is where the challenge really is.
"I don't know how to raid" is sort of meaningless on its own. What part is it you don't know, exactly?