When the concrete is delivered don’t allow the concrete to be tipped away from the job, this would result in the concrete being moved twice, place the concrete direct onto the area to be laid, if this is not possible, chute it into wheelbarrows and move directly to the are to be laid.
There should be at least one person that stays where the concrete is to be tipped, with a rake or placer, their job being to roughly level and screed the concrete sticking to the level pegs previously installed, while others transport it over. Then, using screeds, the concrete should be levelled, ensuring all pre-planned falls are kept to, and the open face of the concrete is then closed using a magnesium float.
Be careful not to tamp the concrete as this causes water to rise to the top and destroy your print. The better the quality of the screeding, the better the overall look of the finished product.