> 慣れるから➜you can get the used to 〇〇

Oh, maybe it was about the wrong tense that got you confused? (so 慣れた?） The meaning are the same as what I expected.

The meaning I wanted to express is:
"Debian, Devuan, I think either one is ok, but you don't need to (take the trouble to) get used to Debian then to install Devuan. If you have any fear it is more practical to try them first in VM."

> もうちょっと説明に疲れたからこれで勘弁(かんべん）して...
Thank you.👍