The description is very detailed and easily understandable for children and includes some facts and background.
One needs in addition some distilled water and empty glasses, then you can start already. The experiments are not difficult and can thus quite be performed by children. But since it is chemical, I would never leave them unattended. One should also be aware not to make attempts in bedrooms or the kitchen.
For the impatient child that's probably nothing, because here it takes some time until the crystals are done. The results have become quite presentable, even if not as pictured on the package (but this is often that it is possible not so good).
The kids liked it, so I would recommend this set.