Unloading refers to removing the G-Force via application of the controls to a neutral position (either forwards or backwards depending on your start point) which is also dependant on your trim.
Power is simultaneously either increased to maximum, remains at cruise, or decreased to idle, depending on the severity of the Unusual Attitude (including factors such as IAS, Mach No and Height Available).
Aileron (up to full or limit) is usually applied to level the wings first, except for larger transport types which often increase the bank in a nose high UA before levelling it close to the horizon as the nose starts to fall through.
For a nose low UA once the wings are levelled, THEN back elevator is used to recover from the dive.
This is not a comprehensive guide, merely an outline of some of the correct actions and considerations.
Such techniques are slightly different than those learnt on dedicated aerobatic types, however exposure to such extreme aerobatic UA's makes for valuable experience and better diagnosis.