You're right to say that the humidity should be upped a bit earlier than 1-2 days before the shed. The best time to start is when you notice the snake's eyes are blue, but this can be easy to miss with certain morphs like albinos and BELs.
Another early sign that a BP is going to shed is that they become more reclusive than normal. I usually see mine sticking his head out of the hide in the morning or exploring the enclosure at night but all activity ceases when he's about to go blue.
Overall, though, the signs can be easy to miss especially if you're having a busy week or not handling the snake every day. It also takes a lot of diligence to keep up the humidity—sometimes requires misting more than once a day. For these reasons, I think it's best to just leave a humid hide (tutorial on how to make one here: https://www.youtube.com/watch?v=tjBFKkbJrRE) in the enclosure at all times (as long as the snake doesn't love it a little too much and stay in it all the time, which may cause scale rot). The snake will use it as needed to hydrate their skin and usually get a perfect shed every time.
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