Remove DE and use CLI only? Hi. I'm familiar with Linux for almost a year and I know CLI basics. Now I use Debian for school and since I pimped out my Plasma environment, I got pretty lazy because of using mouse all the time.
I also want to become a sysadmin one day and I don't want to get stuck with my progress just because of being lazy. 

The question is:

How to safely remove my KDE or XFCE (or any other DE) and use CLI only right after the start?