The worse thing you can do is be jumpy when picking her/them up, When mine was doing this, every time he turned her head to have a go i put him in other hand, and if he/she does bite you try to keep hold of them rather than putting them straight down, easier said than done!
As said handle as much as possible, also i used to feed mine bits whilst in my hands, they get used to you,
Just my experiance with it