It all depends on your definition on "anybody"
are we talking your beloved ones, your boss, your ISP, or your Government
Easiest way I would hypothetically do this "informational purposes only"
Grab a good WIFI card something with a external antenna.
Then find you a neighbor with open WiFI
if you find someone using wep
DL the wep bootable cracker disk.
After you get on board find you a good poxy list set up your network run from the proxy server, The more neighbors you find the better, make a proxy server setup for each connection you find. rotate from connection to connection.
Just a small suggestion,
What are you DL that has you so paranoid?