You left out the part about loosening the home button connection wich are attached to the large heat shield. If it is not carefully heated and removed it will break and you will not have a home button to use. Should be step 37

So, this guide is garbage right here. There is no mentioning the home button connector, wich holds the bottom of the EMI shield in place. You can not remove the shield if this is not loosened. You also need to heat it or the cable will break. I now have to buy a new heat shield since my cable broke thanks to this guide