| Sindenky |
First decide if you want to play slow med or fast progression. For what I'm suggesting they now mean the difficulty of fights, I personaly prefer slow. Next take the amount of exp they need for a level, anD devide it by the number of encounters you intend for them to have before leveling up, either use the books pacing or aim for 12-15. Next take that value and multiply by the number of players. This gives you a EXP pool to build your encounters with, and it should translate into difficulty well. You can chose to up the CR of what they fight, or just add extra baddies, so long as the exp stays the same, the game should be challenging, and they will level at the right place.
On phone sorry for typos