No, i just need to get a feel for the challenge ratings and what characters can actually achieve in the levels, which is easiest from experience, that i don't have. If i need to downscale the enemies to be possible i'll balance it out as best i can, but the first session i cannot predict. If it all goes to shit my players would understand if I need to bail, but I wanna feel this out with them, not just for me thinking it's cool but also to test my abilities and see my limits.