New Tiels!

Just got my new tiels , a boy and a girl, first night went okay, they were a bit nervous, but are now settling down, eating etc, they both are a bit scared of me, but i guess this is expected, the girl usually hisses, when i get a little close, the boy does not, but still nervous. The boy is very loud lol. Just wanted some advice as to how to go about gaining their trust, what sort of things i should do to settle them down in their new home

thanks