Haha... the only time I need to refer to my manual is when I am trying to understand what Noise Filter and Noise Reduction does. Confusing terminologies...
If u dun know then better read. If u know, then no need. If its your first, then maybe better read. If you have owned more than 10 4/3 cameras and have extensive use and experience, then its plus-minus n at most maybe read if necessary. Only if you cannot find your answer in manual, then ask. Otherwise you get RTFM.