Take a look at these slides [1] They're for 2010. Hardware needed? Around 70$. Knowledge? With those instructions, anyone. For the uplink you need to be able to spoof your IP which would require to find an adequate ISP [2]

[1] http://www.blackhat.com/presentations/bh-dc-10/Nve_Leonardo/...

[2]https://spoofer.caida.org/summary.php