I've done it successfuly and it was my first time so it is possible even for beginners. I've even change the battery in the same time. It is not easy but you need time, self control and proper tools (mandatory).... But be carefull, the tutoriel hepls you to the step to change to part. But you will have to get some parts of the old lightning connector and put on the new one, so be very observative and don't throw too quickly the old part. Don't be afraid to compare them... But now i have made a second life to my lovely 5s and i'm really Happy... Thanks to this marvelous website which is really Good. I've bought all parts and tools in ifixit site and it was quick and professionnal. thanks to Ifixit. I want to repare everything now :-)