You’ll be glad to know that the difficulty comes from the syntax and very little from any programming skill level. You learn new ways of writing certain code structures like indented curly braces for example. Programming python might be easier than cpp in vim, not due to the language, but just cpp having more complex syntax to type.

Tldr, almost exactly the same amount of effort whether you’ve been coding for two weeks or two years.

I remember the basic filesystem commands like ls, cp, mv, rm, cat etc, but I generally don’t remember much more than that. Even so, I still use the GUI file manager/software center pretty often, there’s no reason why I have to force myself to use the terminal all the time.

I have an app on my phone to search for commands that I barely use and don’t remember. Don’t worry that much about it if you aren’t a professional system administrator or other such jobs.