Star Wars Battlefront 2 Those "Unbeatable" levels in the Rise of the Empire Mode

I thought that Knight fall was the hardest level, but then I beat it, it wasn't so hard after all. I then zipped through all the other levels on my first life, all the ones everyone else said were harder than Knightfall, you know- Polis Massa, Mustafar, Tantive 4 (which did give me some trouble!), and the Death Star (if that place wasn't so big and confusing it would've been easier!) But now I am stuck on Yavin 4 and can't get past it. I beat it on Galactic Conquest, but only because I used a hero bonus. Any advice or tips would be greatly appreciated!

May The Force Be With You!

Battlefront II thread is what you're looking for here.