I personally recommend watching all of GoT in order, not because it’s good, but because you won’t appreciate the flawless genius of S8E3 without the other 7 seasons of context. It’s a slow drag through those 7 seasons, but once it picks up in the last 5 episodes, it’ll all be worth it, I swear. There’s so much character development packed into those episodes that they’ll seem like completely different people!