Mix the cement powder with water in a traditional cement mixer, ensuring that the cement is stirred continuously until you are happy with the consistency.
Ensure the skip is securely closed and empty the cement mixer into it at ground level. Most skips are low enough that this will not be a problem, while some models tip slightly horizontally to make pouring easier before being hoisted upright once more for discharge.
Attach the skip to the crane hoist if you have not already done so.
Lift the skip to the desired height using the crane hoist.
Open the skip to discharge the cement. In some models, this will be done by hand, using a wheel attached to the side of the skip. Other skips are opened by the crane operator. In this case, the skip will be attached to two separate hoists, with the second hoist designed to pull the skip open when required.