Easy for you to say. It looks like you need to be running Linux. I'm not. I am running OS X. Any instruction pages for that?
Yes, you download the Mac OS X version and make a bootable GParted Live CD version 0.3.7-7. Don't use the current release - if you look in that thread you'll see people have problems using anything newer than about 0.4.x.x - can't remember exactly how new it still works.
I haven't tried this myself but I read the thread getting ready.