Nice one. A couple of questions before I take a leap into the great unknown...
Does it matter that my phone does not boot up? Just asking as the instructions assume that you have a functioning phone!
Does it matter that I cannot enter debugging mode as I cannot power the phone up?
What are the chances of bricking my phone? I'm on contract, but my provider is happy to send me a replacement, which will be a doorstep swap with the courier, although they do not check anything with the phone.
Sorry for all the questions, I really do appreciate the help, but I'm just a little nervous that I could completely screw a £500 phone...