You really have to go to the HTC One forum. Not because we're lazy, just because theyre the best people to help you. Ive never owned an HTC.
What i will say is please be very careful. Youre going the right way towards killing that beautiful expensive phone lol!
DONT follow youtube guides.. i really dont rate them. What you wana do is take your time and have some One users guiding you through it. K
What is your country and carrier/provider?