everyone has some good points in here to keep in mind. The biggest one I think is to remember not to be taken in by a reader who claims that they can help you by lighting a candle for you or giving you some 'magical' herbs. so, please remember to only pay for the 15 minute reading and NO MORE. Do not be taken by 'the extras' that come with an extra charge. In my opinion, if they were really that good, and saw that you needed prayers to help you with any issue that may be there, they'd automatically include that intention in their prayers for you w/o you knowing it or charging you for it!
Keep your question(s) simple and to the point, and as already stated, no yes or no questions. Have your questions written down on paper in a notebook already to go. Be sure to take a pen with you to write down notes as the reading progresses and if there are any questions you have for her as she is giving the reading--ask them. I also would not give my birthdate, but IF she/he asks you, "Do you have a birthday this month?" or something like that-a short "yes" or "no" is sufficient. Also, if she asks you if your sign is a Cancer, or Leo, again a short "yes" or "no". You don't want to get stuck in a daily astrology reading that they could recite.
Most of all. relax. do your best to be relaxed when you go as trust me, this will help her/him to read you easily. Before your visit for this reading, ask your guides to watch over and protect you and to also help to provide her/his guides with pertinent information that you need to hear. Perhaps asking a beloved deceased family member/friend to also help out in that area. I tell all my customers to do this before coming to me--and it really does help me a lot.
Most of all, relax and enjoy this! do remember to take notes. If you can you may want to try to tape it--however, sometimes tape machines will not work during psychic readings. It has happened to me many, many times. Note taking is MOST important. You'll forget a lot of what she/he says, so it is vital to take notes. You don't have to write word for word down--just key points. Maybe symbols for words, such as a dollar sign for money coming your way, that sort of thing.
Have fun, CaliforniaTarot.