I found it quite difficult to reconnect the home button cable connector. After putting everything back together, my iPhone said there was an error with the TouchID. I disassembled the phone again, pried off the home button connector and found that I had not lined it up properly with the mated part. I had to push the connector upwards (toward the top of the phone) in order for it to seat properly. It almost felt unnatural to push the connector so far up to make it seat properly. I tested the phone again before reassembling and everything worked fine. If you break the cable on this home button piece, you can only buy a generic home button (about $8 here on Amazon) that will allow you to use the button for navigation but it will not work for TouchID (you will have to use your phone permanently unlocked or use a numeric code to unlock). The original home button is specifically mapped to your phone and cannot be replaced.