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@HatBeard
like all things with enough repetition you will be able to get a better feel for these things and be less reliant on exact measures,
when I worked in a bar many years ago you were allowed to freepour spirits but only if you sat down with the boss at the start of your shift and were able to to correctly pour 8 shots at varying amounts into test-tubes which had the markings obscured. if you got it wrong you had to use the jiggers to measure the shots that night. most if not all barstaff who wanted to freepour would get it spot on every single night purely because they were practised in it.