I agree with the Godfather, I really dont think they will confuse your hand with food unless you have handle some animals. I always wash my hands good before I handle Ozzy beause of my cat but thats just me being me
I feed outside in a box because I choose to use repti-bark in his cage.
Funny he already assiociates that box with food he crawls right off my hand into the box and gets all set up and ready for me to lower in said dinner.
The first few times I feed him it was in his cage and he seems to know the difference.
I was concerned at first with taking him out of the box to put back in his cage, I would think if ever a time to confuse your hand for food then that would be the time since they are in feeding mode and hands may smell like mouse, but so far so good he just wraps around my hand and goes for the ride back to his cage.