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No, your question is not foolish. NOT asking the question? That would be foolish.
I backsweeten at bottling time, racking from the secondary storage (in my case, potentially more than 1 container) into a primary to leave behind any remaining sediment and to homogenize the wine. Once the racking is started I add sorbate + K-meta to the destination container and stir a couple of times during the rack to ensure it's well distributed.
I reserve a glass of the unsweetened wine as a base for comparison, and always start with less sugar than expected to need, as it's far easier to add more than to take some out.
Stir in some sugar. I stir the wine and pour the sugar in as a thin stream, continuing to stir for at least 60 seconds to ensure the sugar is dissolved and distributed. I typically do with this my son, with one of us running a drill-mounted stirring rod and the other adding sugar. A large spoon or paddle works fine, but I like the drill-mounted rod better. Note -- stir the wine, there's no need to "whip" it.
Draw a sample and taste it, considering not only flavor but balancing of acid. If the wine needs more, add another dose of sugar while stirring.
Repeat this until you think the wine
needs just a bit more -- then stop. It doesn't. Stir for an additional minute, then bottle.
Note that I've been making wine a long time and have the experience to understand how much sugar a wine is likely to need. I typically start with 1/4 to 1/2 cup sugar in 23 liters of wine, and given that my tastes are on the dry side, may backsweeten a lot less than other folks.
Conversely, a lot of folks recommend backsweetening small samples to various levels, and deciding which is best. Then do the math to scale the amount of sugar to the entire batch. This works -- but a mistake in the math can produce an unpleasant surprise.