I'm pretty good at it. as long as they aren't mumbling. lol. I can sign some words and the alphabet. me and my bff always talk by spelling words or mouthing the words and reading eachother's lips. we aren't def (srry i dunno houw to spell it) but they people can't eavesdrop on our convo's lol. but i think it's fun and i don't find it to diffucult but i was mouthing something to my other friend and she had no clue what i was saying.