Discuss your concerns with your lawyer before the deposition so that your questions are answered. There may be areas which are sensitive that concern personal matters which you may not wish to disclose. Discuss these with your attorney so that both of you are aware of these matters. Attorneys who learn things for the first time at a deposition may have more difficulty protecting your interests. The most important thing you can do at your deposition is to tell the truth.
Many cases turn on the issue of credibility.
If a lawyer can prove that your Answers are untruthful, the judge may disbelieve you at trial. At the deposition, listen to the questions. Don't answer before the question is completely asked. Think about the question and pause for a moment before answering. This will give you time to insure that your answer is correct.