Sorry I missed your earlier post. Unfortunately, not being a mac person, I wouldnt know what sort of SVN tools are available or how to use them. Maybe someone else who does use a mac could refer you to a good visual tool? The basic instructions should be the same for both Windows and Mac.
A good visual SVN editor for OSX is Versions - http://www.versionsapp.com/ tho being a terminal fan myself Ive never used Versions to apply patches etc. Should be similar to the instructions you posted