Not a stupid question! I also had this concern when I first got my snake, and luckily I will say you get more of a feel for it as time goes on. Power feeding, as I understand it, is pretty intentional and involves actively forcing large meals on your snake much more often than they should be getting them to try and get them to grow abnormally faster. It would be hard to just do accidentally especially if you know what appropriate prey size and frequency should be. Any other accidental overfeeding is technically possible but I also wouldn't worry about it with a young colubrid only on pinkies or fuzzies. Those prey items are not very nutritionally or calorically dense and even if you were feeding a little too much of them it would just go towards growth and not fat accumulation.
For underfeeding, that's actually what I was doing at first. I was just giving my girl one pinky a week which was not enough to keep her full or growing at her size. It wasn't something that was obvious to me based on observation since I hadn't been doing it for long enough that she was losing body condition. That's where research and asking more experienced keepers about your methods becomes really helpful. I learned that doubling up on prey items, especially stuff like pinkies and fuzzies, was very common and what I should be doing. With that said, you've gotten some good guidelines for feeding here, and moving forward you just want to make sure you have an appropriately sized prey item given around every week, although the exact feeding day doesn't matter that much. That can extend to around every two weeks when your snake is an adult.
Of course if you have any more questions along the way this forum has some very knowledgable people so always feel free to ask. I'm looking forward to seeing Bogertophis's insights on this as well.
And gorgeous kingsnake by the way! He should make a very good pet
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