Communism had only been in practice in some small towns across the USSR - ones that were self-sufficient (and quite isolated) with strong sense of community, but never at a large national scale.
However the pursuit of achieving communism has been disastrous at the larger scale, that is pretty obvious. It's something that should be done over generations, gradually. Suddenly upending an economic model and social framework doesn't work because these are way too complex systems, it's not like the revolutions that overthrew monarchies, as the transition isn't near as complex both in terms of government and economy. Upending capitalism in absolute is what Revolutionary Marxist-Leninist parties want, and which is why they are rubbish and dangerous, and is just a path that history has already gone down before.
It takes small steps, for example you should first set your eyes on Workers councils and Co-determination, this has been implemented in some countries, the most extensive implementation is in Germany (here's the English version).
https://en.wikipedia.org/wiki/Codetermination_in_Germany .
Any way, since I was too young to remember what it was like, most of my family lived in the DDR, and my whole life I have heard of the tough times they experienced, especially the paranoia regarding informants that the Stasi employed. When the USSR dissolved they moved westwards and many have never set foot in the eastern part again due to bad memories.