If you lose your train of thought when speaking, having some talking points written down closeby.
While you should not read word for word from a pre-written essay (this will be too obvious), having something to remind you of key points that they should know about you, is a good "safety net" to have.
The process can feel very official and quite intimidating.
Seeing your interviewer's name and title in your correspondance beforehand can make them seem a lot more scarier than they actually are.
Strongly consider providing additional contact phone numbers they can reach you on.