RE: Classify 3D manoeuvers according to difficulty
I would have to classify as this:
Easy:
Wall
Elevator
Harrier
Blender
Intermediate:
torque roll
parachute (takes balls to do it down low)
inverted harrier
Knife edge elevator
knife edge harrier
Advanced:
Tail touching
Rolling Harrier
Rolling Harrier Circle
Rolling Harrier Loop
Also, I regard people that can combine manuevers into a sequence as more advanced. Say for example: doing a inverted elevator to the deck and pulling to a torque roll. Then going from a torque roll to a rolling harrier loop without stopping the rolling. This is an advanced sequence.