You use a proxy IP address, which is different every time you log on.
You can do it all by hand if you know how, but there is this software:
http://wareseeker.com/Security-Privacy/mask-my-ip-anonymity-hide-ip-address-1.1.zip/347707
Then you make sure all traces of your browsing history are erased from your PC using privacy Software like Paretologic.
Bookmark for later study,I`m still looking into this Tor thing,sounds ok though.What do you think of it?