Hexxit can be tough, as there are lots of new mods to master, monuments to build, voids to explore, and chocobos to ride. Of course, the first night on any Minecraft world can be difficult, not exclusively a Hexxit world. You should begin gathering vanilla items for the first few days.
Step 1: Benchmarking
Estimated time taken: As long as you like
You will start with a book in your hands and that will tell you everything you need to know about the basics of tinkers' construct.Tinkers' construct isn't a nesessity but rather a whole new crafting expansion,you can still craft everything you need without it. Other than that,just play the way you normally do.
Step 2: Gathering Resources
Estimated time taken: As long as you like
Next, mine some stone (half a stack, at least), and craft a stone pickaxe with your remaining sticks (just use the traditional pickaxe recipe). Ore spawns more frequently in Hexxit due to the CoFH Core (diamonds can spawn above sea level), so finding them will not be too difficult. Look around cliff faces for exposed ores such as coal and iron, and mine them up. If you find precious ores such as redstone, gold or diamond, leave them for now as the sun should just be beginning to set and you only have a stone pickaxe.
Step 3: Apply skills you've acquired through playing minecraft
Estimated time taken: As long as you like
In Hexxit, you will play minecraft the way you normally do, just with extra mods and stuff,I'm sure you are probably already aware of this though