Most importantly it is advisable that one looks for an experienced reader. An experienced reader does not necessarily mean one who has been in the act for a long time. Look out for somebody who knows all the processes involved in the tossing of the cards and understands the symbols of the cards. Interpretations can be done through the manipulation of those cards and understanding what manipulation means. Knowing a tarot reader who knows how to read those cards accurately are very indispensable in obtaining an accurate reading.
Finding one who meets the conditions above can of course be easy once one applies caution and reasoning in the search for an accurate reader. The Internet remains the most valuable source of such a search. Look for ratings they have as well as the feedback. Most importantly you can do a review of providers to see what others say about them.
Finally be wary of the reader who says to you that he predicts your future one hundred percent. Nobody can predict the future one hundred percent; however they can give you a course to guide your future.