It won't be as easy as the 2012 Mac Mini.
According to the AppleInsider review
"It's a fairly simple procedure, though not as easy as some of the previous minis from 2012 and earlier, necessitating a spudger, and a set of security Torx drivers."
https://iphone.appleinsider.com/articles/18/11/06/mac-mini-2018-review-apples-mightiest-mini-yet
And after that there's more fun ...