Here's a general ranking of those VFX tasks in **order of complexity**, from *least to most complex*, based on typical industry standards. The actual complexity can vary depending on shot difficulty, budget, and tools used, but this gives you a solid baseline:

---

### **Least to Most Complex VFX Tasks:**

1. **Camera Shake Addition**
Simple procedural effect, often done with presets or controlled scripts.

2. **Camera Shake Removal**
Slightly more involved than addition - requires stabilization and sometimes minor warping correction.

3. **Motion Tracking**
Basic planar or point tracking - used for minor additions or labeling.

4. **Camera Tracking (Matchmoving)**
3D tracking to recreate scene geometry for integration - requires more skill and software precision.

5. **Green/Blue Screen Keying**
Straightforward with good lighting and separation - complex when dealing with spill, motion blur, or fine detail like hair.

6. **Screen Replacements**
Involves tracking, perspective matching, and compositing - complexity varies depending on screen interactions or reflections.

7. **Removals (Wire, Object, Marker)**
Requires cleanup and possibly roto - gets harder if backgrounds are moving or textured.

8. **Cleanup**
General term for artifact or rig removal - complexity varies, but typically involves paint, clone, or minor reconstruction.

9. **Rotoscoping**
Tedious and time-consuming, especially with complex motion, fine edges, or motion blur.

10. **Object Additions**
Includes simple 3D/2D elements composited into footage - requires lighting and shadow matching.

11. **Compositing**
Broad term - blending multiple elements into a shot; can be simple or incredibly complex depending on the layers and depth.

12. **Set Extensions**
Requires matte painting, tracking, lighting, and integration - complexity rises with camera motion and parallax.

13. **Digital Matte Painting**
High attention to detail and integration required - especially complex when animated or involving lighting shifts.

14. **Simulation Effects (Smoke, Fire, Fluids, Destruction)**
Physically accurate simulations with many variables - computationally heavy and skill-intensive.

15. **Previsualization (Previs)**
Can range from animatics to full CG sequences - complexity depends on storytelling, animation, camera work, and overall planning.

---

Would you like this in a table format with descriptions or relative difficulty levels (e.g., 1–10)?