Gratch, what level you need to be to realistically do the expansion?
I think it unlocks at 60. With the way they're redone the leveling structure, though, I actually hit max level about midway through the first expansion (Hutt Cartel). Everything story-wise is basically all just easy mode now. I literally didn't use a single healing item or defensive skill through my entire 100+ hours with the class story and 3 expansions.
The story is fantastic, but there's no challenge whatsoever.