I agree with Mr_ARPY. You don't necessarily need large hands to muck, it's enough to know the angles well enough to be able to hide the card even if it shows on one side of the hand. It's just one of these things you have to practice with the mirror to get it right.
I second the Father Alex download; it helped me get started with mucking and the 2 mucks (and a variation on the second one) are explained well and clearly.
Richard Turner's "The Cheat" DVD is, in my opinion, not the best place to start, as there is - correct me if I'm wrong - only one muck shown, and mucking isn't Richard Turner's primary focus.
I'll let somebody else do the extensive Steve Forte advertising for me, but if you're interested in gambling stuff he's your best bet. His Gambling Protection Series must be really incredible, and I'm sure there's something there for you as well.
By the way, Mr_ARPY -- Where are those links? I'm interested as well!