First download the correct version of Subclipse:
Extract the zip file and copy the two folders:
To your plugins folder, in my case:
Fire up the developer studio and you should now have the subversion perspective available.
Menu: Window => Open Perspective => Other…
Select SVN Repository Exploring from the dialog.
Right click on the SVN Repository windows to add a new repository:
Menu: New => Repository Location…
You will now see the following dialog:
Simply enter your subversion server address and user/password if required.
You should now see your source code, right click on the Trunk folder of a project and select Check Out as Project.
Cogs will start turning and when finished you will have a shiny new project to play with.