My phone was having issues with charging. To charge it I had to hold the cable at just the right angle.
First of all, everything from the packaging to the tool kit to the part are top-rate. I've had my phone 6S. apart a few times so this repair was no big deal (I installed a new battery from iFixit about a year ago). It wasn't at all difficult, just time consuming due to the number of screws and the various sizes of screws involved. Those tiny antenna connectors are tricky to get re-seated, but the rest was easy. There's a little pointy tool included that is perfect for aligning parts and ejecting the sim card.
Get a LARGE sheet of white paper for your work surface and a pen (See Photo). Then you draw little diagrams showing which screws go where. Note that there are six or seven different screw sizes involved. There is a 'repair mat' that you can buy that does the same thing. Also the LARGE sheet means you're less likely to drop a screw. Some of the screws involved are TINY so if you were to drop one on carpet it would be lost forever.