No terminal change, you'll stay in Terminal 3. Since you'll be coming in on the domestic side, I recommend first eating at somewhere on the nonsecure side of the terminal. Then heading over through immigration and security to get airside. If you have lounge access (premium class, or economy + Star Alliance Gold), you can head over to international airside sooner rather than later. Without lounge access, hold off heading over that way until as late as you can (departure minus 1.25 hours).