The nature of reading sediments is that you need to recognize shapes. It is a good idea to clear your mind before hand. Who is most qualified to read your leaves? Generally it is you! Everything is subjective, and you will see things that you need to see that others may not. Some people divide the cup into three sections, base, middle and rim. There is an exhaustive list of what the symbols can mean. There are probably as many different ways of reading tea leaves as there are those who do it, and you can find several online resources that are great. Step by step instructions can be found at Tasseography.com which are marvelously in-depth and include a list of symbols at the end.
After looking through the instructions this is definitely one type of divination that I'm going to try! If nothing else, the tea will be delicious!
** I found the picture in several places online with no credits. If you know who to credit, let me know. **