Remove the hump plate, then you can disconnect the driveshaft and unbolt the tranny. I support it with a floor jack. The tranny will move back enough to work on the clutch, depending on what truck you have. It is best with two people, and once you have the tranny moved back far enough you can stabilize it with a 2x4 across the floor opening and a piece of chain or heavy rope. Turn it sideways on the jack if you need more clearance.
If you need the tranny out from under the truck there are two options. Easiest is an engine hoist in the passenger door with the seat cushion out. To take it out underneath you can remove the shift lever and take it out on the floor jack.