The only thing I was a little confused about was having to download the 3.0 firmware after I had just installed the 3.0.1 firmware on my iPhone. But, you just need to download 3.0 to run the QuickPWN tool. You don't actually install 3.0 - QuickPWN just needs it to run the program. That link above should give you what you need.
Forgot to mention - beware of the battery drain. There are a ton of threads on the battery drain issue with 3.0 firmware, but I had to turn off push for Outlook e-mail to get my battery to work as normal. I think there have been a lot of different 'fixes' for different people, but that worked for me. Kind of a bummer that I had to turn off the push.