My iPhone 6 Plus display recently started flickering and, at times, became unresponsive unless I literally forcibly twisted the phone in order to get it to respond. This issue was extremely annoying and frustrating, especially when trying to answer a call. So, I had three choices. Buy a new iPhone, take it to an Apple store and have them repair it or "iFixit" myself! I chose the latter.
I'm a service technician by trade and I've worked on and repaired many things in my career, but working on something so small and delicate was not something I was looking forward to doing. But, thanks to iFixit's amazing videos and pictorial guides, I felt confident I could handle the repair. In about an hour, I had the phone apart, repaired and reassembled. I bought the iFixit Fix Kit for the task and the tools worked great. Now, my iPhone is as good as new. My only regret was that I didn't order a new battery. Also, I would have posted images, but the phone is my camera, so...
My advice is don't hesitate to give this repair a shot. It is well worth it.