What's The Playbook For Job Interviews?

What's The Playbook For Job Interviews? I know this is asked a lot but seriously what can you do except tell them you have a speech impediment? On the email they included an email if you need any accommodations but not sure if stuttering counts? I have quite a severe stutter when I'm nervous and will stumble or hold a sound like "ssssssssss" on almost every word and will try to move around words when I can but it ends up just sounding wrong. This is for an internship position at a really good company so I would really hate to blow it. Any tips would be appreciated!