If you thought UHS was difficult you're in for a wake up call. Good luck trying to punch trees this time sonny boy. You're going to need to scrounge for sticks and stones if you hope to survive and even then you're going to have a tough time of it.
A unique modpack devoid of all standard amenities such as Inventory tweaks, Optifine, and even NEI.
Designed to be difficult and challenging, where the winters are long, food is scarce, and everything from dirt to stone will fall on your head if you give it the chance.
Feel free to stream, Youtube, Ect.
For beginners I recommend you keep the wiki page open. http://wiki.terrafirmacraft.com/