It's pretty easy to pick up. A couple differences from windows - if you just close the window in an application, it will still be running. You have to go into the menu and click quit (or press command+Q). There are also a lot of differences in what each OS calls things that are more or less equivalent, so that may take some getting used to. However, it is not so different that it is very difficult to learn. You should be able to find your way around pretty easily.