I've got a 3gs with an old tethering crack on it, and am considering upgrading to 4.3.3 to get this jailbreak. How can I be sure that this will work for me, and how do I go about tethering afterwards? Googling only seems to turn up some app that I have to buy from some other store (a cydia store?). Is it more complicated than the help.benm.at tethering hack that I used?