Yeah, in most cases, clients don't give two fks, they just want their work to be done. Its your own employer that over thinks. Also, since the competition is so fierce these days, there are plenty of candidates, who don't stammer, to fill your position. Deep down, we know we can do it... its the first interaction that lets you down. And since we are all nervous during our first interaction, we stammer more. Hence, many couldn't even pass the interview stage.