Dying Light - Prison Heist On Nightmare With A Level 1 Character

As stated in the title, I attempted to finish Prison Heist on nightmare without upgrading any skills. This was ridiculously challenging, especially the middle volatile room. I had some bad luck too with a grenade bouncing back towards me and killing me. Overall I'm quite happy with this, though it took a while to prepare with all the flare / grenade / medkit / DROP farming.