Just completed this upgrade a few days ago, having purchased the 1 TB SSD kit from IFixIt. The kit arrived quickly and the tools and drive worked perfectly. The step by step guide posted here is pretty much flawless, but do pay attention to the specific comments from users on certain steps - they really help. As far as ensuring that the new drive will reboot and install MacOS, I watched 1-2 videos on YouTube about re-installing using the Internet Recovery tool and that worked perfectly. My MacMini is performing WAY better than it used to, for only a $200 upgrade kit and about 3 hours of work, all in. Thanks!