You'd be surprised how little knowledge it takes for someone to DDOS someone..
From a story I've read.. some 13 year old met a hacker over IRC and the hacker pretty much told him "To attack someone, go to this IRC room,type this command and their IP and press enter"
The person didn't even know how it worked to attack someone, but he did it successfully many times (very similar to vB's case)
I think someone on #vborg sent me the story..
Regards,
Patrick