The Star Destroyer can be brought down in one try on Apprentice difficulty. The highest level I've played it on 360 is the Sith Lord difficulty and I did it on the third try. The key is taking out TIE's quickly. Once you have mastered that, it won't be that difficult.
As I said in my review, I don't like this part despite mastering it. It's my least favorite thing to do in the game.
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