Tell your advisor that you have a list of questions and double-check the list at the end of the meeting. Write down notes of your advisor's answers as you go along. Go as slowly as you need to. Be sure to clear this with your advisor ahead of time. Ask your support person to take notes for you during the meeting.
Some people find it helpful to tape record their meetings with their legal advisor.
If you think this would be useful, be sure to discuss it with your advisor in advance. Before you leave. Before you leave, go back over what's been discussed and ask your advisor to help you come up with a plan of action based on the advice you've been given. This might consist of getting certain information together, or having a plan for things to say and questions to ask at the next mediation session. Write down notes of your plan of action.