Even a **** use his brains, insert the sim, connect the phone to itunes. Make sure you have itunes 9.01 or higher. Wait untill itunes recognize your phone, then synchronize it with itunes, as new iphone what ever.
Then after it finish, run spirit as administrator. Right klik on spirit to get the option. If you are using windows Xp, just run spirit!
Succes, good luck!