Pay just a little more here for the best part out there!
Cracked screen on my iPhone 6
I paid a little extra for the full assembly and only had to change over my home button leaving little room for error and it makes for a very quick and simple repair. Special tools are required which I had but you can always get them with your part as an option. You can search this repair on youtube but if you already know how to open an iPhone 6 than you can figure the rest out. It's that simple if you buy the whole assembly for and extra $10 or $15 which is well worth it. Just take care in removing the home button because the one that comes with your phone is the only one that will ever read your print. Replacements will only work as a button and not a print reader.
Don't go elsewhere for the cheaper parts because you get what you pay for. I buy all my parts here when possible and get the warranty and support to back it up. So far every part has been a perfect replacement and no problems thanks to ifixit.