So, I'm in the process of snagging the source tree for TiddlyWiki (which, if you haven't encountered it, is a personal wiki-like "notebook" in a single web page). Anyway, the instructions for getting the source on Mac and Windows each have an 8-step process explaining what to click on a GUI Subversion client.
Getting the source on Linux, by way of contrast, is a single command:
svn co http://svn.tiddlywiki.org/Trunk TiddlyWiki
BTW, the best collection of TW plugins appears to be at TiddlyTools.com.