Kevin it is a VERY big deal.
Not all snakes hit right off the bat, not all of them are efficient constrictors.
Putting a disorientated and confused rodent in with a snake can result in some VERY nasty bites.
Live feeding can be done effectively and safely, but it is imperative that live feedings be done responsibly.
Not to mention it is not a very respectful way to treat your prey item (yeah, I know it is getting fed off). But for many of us, feeding live means treating BOTH of our animals with respect.
I seldom tell someone that their advice is *wrong*... but in this case I think that is a very inappropriate piece of advice to give a new keeper.
Bruce