A kid of mine knocked the phone off a table MINUTES before I was going to do a battery replacement (also an iFixit part). The screen was shattered. My fingers are still recovering from cuts. We need this phone working on trips, as it is an important communication device.
It went well. There were a couple of issues that I ran into. First, the screen was so badly cracked I had to use clear packing tape on there to open it. Second, you NEED to have the Pro Tech Kit—it's so awesome. I even use it to work on yo-yos, spin tops, and other small repairs. Second, if you're working on Apple products, just get the iSclack. Thank me later, it's money well spent. I did have some issue with the iSclack though because the suction cup kept popping off the tape, so I had to have a tool ready to tuck in where the face separates from the body.
Be prepared for the suction cup to lose suction. Read the instructions. Watch the instructions. TWICE. Take notes. Repeat. Then go try the repair. If you don't, you may overlook something. Be patient and work in an environment where you won't lose tiny screws. If you don't have a heat gun, get the iOpener. I may get this anyway, as I prefer a gentle heating solution as compared to a heat gun. If you use a heat gun, also use an infrared thermometer.