To enable the Subversion plugin in Eclipse, using Help->Software Updates->Find and Install...
Select "Search for new features to install", then the "New Remote Site" button.
Create two new Update sites:
http://subclipse.tigris.org/updates
http://tmate.org/svn/
Follow the process and install the items in those two sites.
Restart Eclipse, and in the Open a Perspective button on the right of the toolbar select SVN Repository Exploring (it's probably in "Other", at least at first). Using the New Repository dialogue (right-click or use the New Repository button on the far right of the SVN Repository view), enter the information for the ModX repository:
url:
http://svn1.cvsdude.com/rethrash/tattoo/ (watch that final / !!!)
root url:
http://svn1.cvsdude.com/rethrash/tattoo
your login and password.
You should see the three subfolders for the project. Copy the trunk folder into your personal folder under branches (this may not be the best way to do it, will edit if I find out better later).
Finally, save the perspective in the Window menu. There is an extensive Help file for Subclipse in the main Eclipse Help menu. Basically, you set up a local working folder, "check out" into that folder, and go for it.