A bite from a Heloderma lizard is not considered to be lethal, how ever it can be serious and should be avoided at all costs. You don't really need cavilar with Helodermatid lizards. Use regular leather work gloves, If you are bitten the leather will act like a dam and catch most of the venom. You still will bleed some and may sting a little, but you will avoid a heavy envenomation. Also it is best to have the gloves a little loose so you are able to pull your hand out if you are bitten.
Now all of that being said if you are careful in handleing your lizards you should not be bitten at all.
I hope this helps you out with your delema.
Merry Christmas,
HorridumAngeli

HorridumAngeli's Beaded Lizard Web Site