You don't need to study it very much at all:
- Check difficulty level of adventure you wish to play.
- Activate appropriate buff in Scouting Post.
- Start (and play) adventure
It doesn't need to be any more complicated than that, but if the buff is still running when you finish your adventure then you can add:
- Start (and play) another adventure within the difficulty range of the buff you chose.
- Repeat until buff runs out.
I'm confident that there will be thousands upon thousands of players worldwide doing exactly this and quite happily enjoying the extra experience with little or no concern for exactly how much, instead of getting wound up about the minutiae of how it is calculated.