The Enterprise Architect UI can be overwhelming, especially in the beginning.
Fortunately, you can drastically slim down the user interface.
Customizing the available MDG technologies
You can select the available modeling languages by selecting Extensions → MDG Technologies. For Embedded Engineer, the only two technologies you'll need are
Basic UML® 2 Technology and LieberLieber Embedded Engineer
Customizing the available options in menus
You can drastically reduce the UI by selecting View → Perspectives...
Here you can select predefined perspectives, and create new ones. The most interesting part, however, is the option Menu Sets where you can deselect functionality you might not need. Only selecting the functionality you need on a day to day basis can drastically improve your efficiency when navigating menus, and makes it easy to discover the various functions.
For more information, visit the Enterprise Architect User Interface Guide.