Three categories of training, not one
A92.24 separates operator training, supervisor training and familiarisation. Operators get the full course. Supervisors, meaning anyone directing MEWP work, need their own training covering selection, hazards and the rules that apply. Familiarisation is machine-specific and happens when a trained operator meets a model they have not used.
That third one matters for rental specifically: a trained operator still needs familiarisation on the actual unit that arrives, and the supplier is expected to provide it on delivery.
A written risk assessment before the work
A92.22 requires a risk assessment for the task: what could go wrong, what controls are in place, and what the machine is being asked to do. It is not a form to file, it is the process that catches the job where the right machine is not the one already on the trailer.
A site survey, before the machine arrives
Ground conditions, slope, drop-offs, overhead obstructions and power lines, wind exposure, traffic, and whether the floor can carry the point load. This is the check that decides whether a slab machine is usable at all, and it is the one most often skipped on a site where "the pad is finished".
A rescue plan you have actually thought about
If an operator is incapacitated at height, someone has to get them down. That means knowing where the ground controls are, who is trained to use them, and what happens if the machine itself has failed. A plan that consists of calling the fire department is a plan, but it should be a deliberate one rather than a default.