I don't think it's worth disclosing, it plays into our own heads more than theirs. I believe we should not be thinking about it in the slightest but I do agree we can do this while stuttering. I've done sales for almost a couple of years now. You don't have to rely on disclosing anything and if it's noticeable they will admire you that much more for it but try not to even dwell on it. Worrying over it doesn't help anyway. Then less we think/worry over it, the easier it is, like a loosening thumb trap. I do sales and I'm a Male but I knew a women lawyer from India who stutters. I don't think she did speech therapy but whether she did or didn't, she kept going anyway herself and became a lawyer.