The old wisdom was to remove all widgets and icons from stock launcher before installing custom launcher, because the old stuff would still be running in the background. Is that still true?
Not sure about that, perhaps someone else can help.
But I would say don't do this initially as Nova Launcher allows you to import from another launcher, so that will make the initial setup much easier. After that by all means switch back to the stock launcher temporarily to delete everything if someone says it makes a difference.
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