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It's logical assumption that more complex artillery is operated by more experienced people but at the same time my significant other's cousin's boyfriend is operating a rocket launcher 4 months after joining Lithuanian army here.
Of course rocket launcher might not be heavy-heavy artillery but I'd assume war equipment has a quite gentle learning curve and is easy to use.
My mom still knows how to assemble ak-47 in some seconds because it was part of what they teached in schools in Soviet Union.
Also:
A friend of mine who follows more of russian media outlets said their "experts" still are saying sanctions won't impact them but at the same time for some products consumer prices grew for 30% in just those couple of days.
In electronic shops there are signs saying "prices might not be correct, check with supplier" or something and when you check the actual price it's + 30%
It won't be young kids operating the heavy artillery :/