Generally speaking it's not said that you have taken a drink, taken a turn, taken a college course etc until you have completed whatever it is that you are taking.
Ummm... no.
I've taken a computing course for a year and a bit. I haven't finished, but I've most definitely taken the course (just not to completion).
Further more, ruling otherwise means you still have your action available until you make all the attacks. So I can take the Attack action to attack a creature. Then since I haven't taken an action yet, I can kick down a door, and attack another creature. Then, because I'm an 11th level fighter, I'm stuck at the next door because I did take an action to kick down the last one, so I use my third attack against the door. But then I can't, because that would mean I've taken two actions.
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