Keep moving; hit target lock for towers/nests and circle around while holding the Fire Breath trigger/key down. Once you take out most of the opponents you will automatically return to the battle tower.
The ballistas shouldn't be much more difficult than the nests, as long as you don't hover in one place or fly straight at one. You can fly away behind the battle tower, or whatever, to heal or otherwise rest up. Save before making a run at the ballistas, and you should be able to whittle them down.
On the Xbox, a burst of speed is triggered by the left shoulder button. On the PC this is done by right clicking.
first time dragon help needed pleaseWhy is dragon so hard?
