Excellent guide! I used a silicone “soldering” mat with a bunch of screw “wells” to keep all the screws in order for reassembly. The procedure went very well, but I could not fix my phone.
My iPhone 6 GPS stopped working, and this flex antenna is apparently the culprit. Unfortunately for me, I found that one of the antenna connectors on the main logic board had come off, and the connector itself fell apart as I disconnected it from the original flex antenna. I do not have the equipment to reattach it anyway, so I just put the phone back together as-is (with the old flex antenna connected to three terminals instead of 4). Needless to say, my GPS still does not work, but I am confident that I know the reason, and now have to decide if I want to take more extreme (and costly) measures to fix the phone or not.
Update: my new home button is still working as a button, but my phone battery is draining at an excessive rate. I have checked my steps, and the hardware connections all seem good. Internet searches seem to indicate that the touch ID software in the phone may be running continuously, I suspect that the home button I bought might not be a good one (not from iFixit). I am going to try again with a hopefully better button.
I purchased a replacement button which included a new gasket. The hardest part of the entire operation was applying the new gasket to the new button, as it kept sticking everywhere I didn't want it to.
Excellent instructions! I'm happy to have my home button back.