Boatboy24
No longer a newbie, but still clueless.
By all means, when you eventually add MLB (if you are doing an MLF) and eventually eventually Kmeta, I always remove a few liters of the wine because you will get a volcano when you add about anything to a young wine full of CO2. Then I add back the few liters after the intense fizzing abates.
What I do in those situations is remove a cup or so of wine into a 4 cup measuring cup. I add the 'stuff' (whatever it is at that time) to the measuring cup and dissolve it in there. Then pour into the carboy.