This was my first time doing something like this and there are some things i would do differently.
1. Mix-a-mold, did not work that great. I wanted to use the food safe silicon mold maker but could not get it in time so had to go with what ever I could find in the art store. I can't reuse the mold since it turned slimy and gross in the frig. Have patience and order it on line and go with the silicon.
2. Don't cool your chocolate in the frig, there was a lighter color chocolate film on the outside of the rat and was a real pain to remove. I think is because it cooled too quickly. It could also have been the Mix -A-Mold's fault.
3. The frosting that the hat and hook are made out of is called Fondant, I have a feeling this is why wedding cakes taste funny. They told me at the fancy cake store that it was like working with clay, i would say more like bubble gum. Since there seemed to be an abundance of different moldable edible stuff i would try something else next time.
So follow my steps and learn from my mistakes and you should come out with a fine little Pi-Rat