You would need the gearbox and the gearlinkage ie from the box to the gearstick.
You would need to change your pedals from 2 to 3 pedals.
You would need the clutch cylinder, reservoir and pipework, and to install this.
You would need to check that the automatic driveshaft would fit the manual application, ie from back of box to rear diff.
You would need to ensure that the box matched the rear diff, if it wasnt a match you would need to swap the rear diff for a matching one.
You MAY need different gearbox mountings.
This is just off the top of my head, it is quite a PITA, but it can be done, is it really worth the hassle? Is usually the biggest question.
Hope this gets you thinking in the right direction.
Callum W