30 minutes - 1 heure
That was my eldest kid's phone which had a broken lightining connector and a unnusable camera. I got the chance to change the old battery for a new one too, since it had almost 3 years of use.
It was relatively easy to open and disassemble the iPhone, though I had some trouble to reassemble it. I had to reopen the phone cause the digitizer cable wasn't correctly connected, but in the end everything went perfect.
Please pay strict attention to the disassemble steps, lest you can get caught with cables you don't know where to connect. And would be important to alert people that the spare parts are different from the originals.
iPhone 5s Replacement Battery
iPhone 5s Rear Camera
iPhone 5s Lightning Connector and Headphone Jack
iFixit Opening Tool