I find them easier then they were.

Style Branch combos, and combos ingeneral have been made somewhat harder. Depending on the combo anyway... But just calm yourself when you're doing the combo, if you're all tense and slamming on the buttons you're only going to screw up.
As for the Hara Kiri's, they're easier than fatalities. Since you don't have to be at any certian distances and such. Just pull if off before you get hit.