Read the insert in your tarot deck.

These are prepared special for each deck.  There is no standard insert.  They are all different and should be read carefully.  It's like a little book with all the answers in it for a reading.  You want to be able to flip through it very quickly as you do a reading and eventually you won't need it for some cards.  Each card is represented in the booklet and if you ever need help in the middle of a tarot reading, you should not be afraid to use the little insert in the deck.  It is not unprofessional at all to consult the insert.  You should not be afraid to do it.

Usually the insert contains a list of words that you can string together in a few sentences.  Tell them to beware of the bad things in the cards, but to cherish the good things.  You want to be a good counselor in addition to being an accurate reader.