My iPhone 6 Plus case bent and made the phone unusable because of the broken screen due to the bent screen. I ordered the complete screen from IFIXIT and took the phone apart but then a friend had an iPhone 6 Plus that he dropped on the water that affected the logic therefore I got a free case that I can use to transfer the internal parts of my phone to the case that I got, but procrastinated and eventually misplaced some of the parts and screws.
I decided that I wanted to phone together, thus ordered the complete screws and I was able to put the phone back together again. I was so happy it booted on the first try.
Get your parts here at IFIXIT and you'll be able to do it on the first try.