No you just download TOR and start using it. Basically it joins a network and there are a bunch of "exit nodes" which makes it sort of like a VPN. It will randomly pick one each time you use it. You can press a button in a menu to swap exit nodes if you need to.

I wouldn't recommend planning a revolution with it, nsa / fbi etc have it but use it for browsing the web where you want your identity masked at least somewhat.