We just have 3 very different corn snakes when it comes to shedding.
Ember, my Keys (AKA Rosy Rat) snake won't use a humid hide, won't soak in water. If I put wet moss or paper towels in his favorite hide (trust me, we've tried!!!) he just sits out in the open and gives me the evil eye. And he won't go into a separate humid hide. We live in NM and its very, very dry here. We don't worry about humidity in our vivs. We just gave up after a few months. It would be a full time job keeping the humidity up. As soon as we mist them, we come back 30 minutes later and it's all evaporated. I just keep a very close eye on him and if he has a bad shed, I immediately get a warm, wet hand towel and help him crawl through it and viola! he's smooth and silky in a few minutes. This last shed a few days ago he got it all off perfectly.
Flame, my younger daughter's Creamsicle, has a humid hide and if we put it under his heat lamp with wet paper towels or wet moss he will use it as soon as we provide it after we notice he's in blue. Then he always has a perfect shed as long as we keep the paper towels (or moss) pretty damp. My daughter's seen him soaking a couple times before a shed.
Trinket, my older daughter's Snow, is really hard to tell when he goes blue. The only clue is if you can not see his pupils clearly. They don't even look "blue" like the other two's eyes. They just get blurry and you can see them clearly. And of course the color is already white so hard to see it go dull or anything. He's just now a year old, but so far he's had perfect sheds all on his own. He's not a soaker or has a humid hide. That might have change as he gets older.
So, I don't think one-size-fits-all advice is going to work for every snake. Some just won't soak even if they are provided with a big enough soaking dish. The first bad shed I had I was freaking out and was running around like a chicken with my head cut off at 3am. I tried to get Ember to soak in a Rubbermaid bin with a wet towel, he wedged himself up on the top near the lid, as far away from the water as possible. That's when I learned the trick of helping him crawl through the wet washcloth or hand towel. His water bowl is big enough for him to soak in, but he doesn't do it.