have tried this set-old daughter with my 7 weeks. She found only stupid cold when footprint, otherwise you can do it easily. First is kneaded by the impression material, desperately needs a smooth, flat surface on which the material is then rolled. It is enough impression material, so you can also make a few failed attempts. And even you can, if you do not wait too long, just knead again and roll out new. A sharp knife and a ruler should also be prepared. It simply pushes the hands and feet a few seconds straight in the mass, cutting the desired shape from (I round footprints chosen) and puts them out to dry. Only 6 h with motif upwards, then another 24 on the back. Done. At the end the whole thing has a consistency like foam rubber. It is not so rock hard and fragile as gypsum. I can only recommend.