Shackles will be the hardest depending how rust the shackle bolts are , and doing a torsion twist is simple .
Jack the front of the truck up to take the weight off the front wheels , follow the torsion bars to where they bolt under the front seats you'll see 13 mm bolts on each side, sprAy some deep creep or pb blaster on the bolts and tighten, making sure to measure as you go.
The gas tank side is usually in further than the passenger side because of the gas tank,don't tighten too much not only will it make your ride really stiff but can cause too severe and angle for front cv axles