Feed them in their enclosure, moving them causes too much stress, its also a cause for the potential for regurgitation to occur. If you handle your BP correctly and you know their personality you can see the difference in their attitude when it is time to feed and when it is not. Mine have never mistakenly taken my fingers for food, now typically i dont handle my snakes a day or two before feeding just because I know that 4 out of the 5 have a insane feeding response. so at that point i know they may just try and take my hand off lol. Tap/hook training is best to utilize to assist in this type of behavior. I'm having to get my Boa tap trained cause she is forever roaming looking for something to eat, she just sits at the doors waiting for me to give her something...lol so when i open the doors shes ready to go, thats when i just lightly tap her on the head to let her know its not food time and at that point she snaps out of her hunting mode and i can pick her up with out her taking a shot at me.