OR, I agree with mum and others here to concentrate on what you DO want. You should be prepared and use all evidence and facts at your disposal. Still, I think that believing that you will GET what you want is the most important step. Expect that the judge will see the truth and believe you. Expect that your lawyer will do his or her best to get you what you want. (Fire them and get another if they do not.) Expect the court reporter to be sympathetic to you. Expect the bailiff to be kind to you. I believe that going in with this attitude, that these people are there to help you get what is best will actually help you more than going in with any fear and doubt. Protect yourself, be assertive, be proactive, but also be confident and peaceful that you WILL get what you want. We are all pulling for you here.
Also, go ahead and give the court all the relevant facts you have. The court likes facts, they make it easier to make a decision. The court doesn't like hearsay, it makes it harder to make a decision. Help make this decision as easy as possible for the court and the judge will be more likely to decide in your favor.