That was mighty patient of your group to teach you a raid with a divinity run included. Most groups require a decent amount of clears and for very good reasons. Divinity can easily add another hour to any average run depending on skill of the group.
You don't need muscle memory, as you put it; you just need adaptability. Every raid group runs them differently, and has different strategies. While mechanics remain the same, it's up to you on how flexible you can be.
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If it takes that long then it’s obviously a communication problem, I was able to obtain Div on my first GoS run too. There is no issue if you run with people who are good at communicating and giving instructions