It is very difficult to offer meaningful generic advice for litigants-in-person. A new website has been launched to help DIY Lawyers. Your experience will of course depend on court, the nature of the hearing etc. You might want to check out the following article How to represent yourself in court which might give you some pointers, such as make sure that you know where the court is; aim to arrive at least half an hour early; bring at least three copies of documents that you want to rely on (extras for the judge and the other side); check the court listings to find out where your case is being heard; familiarize yourself with the legal arguments and the likely court procedure.
Consider taking a McKenzie friend. They can’t speak on your behalf but it is someone who can sit, support you and quietly take notes. Don’t get too worked up about what you call the judge – but stay clam and remain polite.