I think you make it sound too easy when it comes to DIY projects. The iPad is a very delicate device. Just a few searches on the internet reveals many problems independent repair shops are having where the digitizer replacement goes fine but something else goes wrong (most notably the backlight!).
I would urge people to choose the right independent computer repair shop. Choosing someone with a good reputation and ideally someone local to you, so if you do have any issues, you can go back to them with no hassle.
Oh, the iPad mini is definitely not a DIY project!