My local PC hardware store offers assembly and setup services for ~20€. Includes installing and updating the OS and drivers, as well as stress testing to verify that the components perform as expected. More places should offer that option, really. Especially if they also sell pre-built PCs that are assembled in-house.

What power do you have when there’s no one to subject to it?

17cm/s seems awful low. Is that its speed relative to Didymos?

Your math ain’t inherently wrong though. Without strapping a torch drive on that thing it ain’t going anywhere.