25 minuten - 1 uur
Customer's iPhone wasn't turning on or charging, had to rush the order out based on the problem she described before receiving the device because I'm in New Zealand. Shipping was pretty quick nonetheless, received it the next week.
Received the phone and before I started taking it apart I noticed a few things. Firstly, one of the external screws were missing and the other was a Phillips, meaning the device had been opened before. Secondly, a lot of screws internally were missing, and a few components were cosmetically damaged. Horrible job by either someone who previously owned the device or worse, a dodgy repair shop (which are plentiful here). The dock connector was also black, this was a white iPhone, so I'm guessing that component was replaced before. They either didn't bother checking iFixit or decided to do it without the proper tools.
I decided to go ahead with the repair anyways. Once I had the new connector in I just tacked on the battery and plugged it in. The device instantly powered on and the charging indicator was displayed. I then followed the guide in reverse to put the phone back together and the customer was very pleased with the professional and timely job.
If you don't have enough business to maintain a stock of common parts (screws, connectors) for your customers' devices, be patient. Advise them that you would prefer to order the parts once you've seen inside the device. I lucked out, but I also had to tell my customer if she wanted her iPhone to last as long as possible I would need the device back once I ordered in some replacement screws. If you're a wholesale member on iFixit you're already going to be cheaper and more professional than the guys around your area, and most people don't seem to mind waiting for that.