You gotta get bit to know how bad the bites will be. Try resisting jerking your hand away, which is WAY easier said than done! You'll learn that they have different levels of bite and they will very often warn you before biting. If they're fluffy, if their head is down or if they make growling noises, now is NOT a good time and you should come back. I'd also just put a seed in the palm of your hand and wait for them to come down. They WILL bite you to test and see if your hand is a steady perch. That's quite often what bites are for - can I step on this thing? Once they trust you, you'll get warning nips before a "latching on" bite. Good luck!