Re #1 whether or not it’s a disability is on an individual by individual basis. To some people it is but to others it isn’t. There’s been a push to frame the stuttering disorder in terms of the world health organization’s terminology on disability. It’s quite good if you’re interested. http://stuttertalk.com/international-classification-of-functioning-disability-and-health-and-documenting-treatment-outcomes-with-dr-scott-yaruss/ Re #2 it depends. No job is out of reach but sure, stuttering can limit how well you perform in it.