Do you know anyone who was lazy and irresponsible but managed to change their attitude and end up being successful, if so, how did they do it?

One of my favorite stories is that of my uncle, who was really lazy and ended up being a programmer after working as a gardener and having a hard time finishing his degree.

Does anyone here know someone who is successful now but who 10 years ago would have said “this guy isn't going to be successful”?

I'd like to know how it's possible for someone to change.