How can you break stutter-related habits?

How can you break stutter-related habits? I've noticed that I have a few stutter-related habits: blinking/closing eyes for a longer than normal period of time and also saying 'sorry' after I do stutter. There's also saying "umm" but I don't mind that one as much. I can't seem to break these habits. It seems like it'd be something easy to correct but I feel like I haven't been able to. Does anyone else here know what I'm talking about?