don't do it! if your snake is eating f/t don't take the risk of feeding live.. stick to what you're doing.. people sometimes just want to see snakes eat a live animal because they think its "cool", i can understand feeding live out of necessity (which i have done with both of my BPs, and i didn't have a problem with it) but feeding live for entertainment should never happen
live are usually more expensive anyways, and can hurt your snake.. let the neighbors try to constrict a mouse to death and see if they like getting bit by a nasty rodent!