First of all you are going to need a very expensive kiln (oven) in order to fire or bake the porcelain. Depending on how far back you want to go in the process, you will basically have to be set up like a ceramic shop. Your best bet might be check with ceramic shops that offer classes in making things, and see if you can take a class for piggy banks, and basically you would do all of the work there, and pay for using their supplies, and they would tend to doing the firing for you at their site.
Some times these items have to be fired more than once. The only way I know this much about ceramics is that I used to have a friend that had a shop and I bought a few pieces from her, and sometimes visited with her in her shop while she was working and didn't have a class going on..I have occasionally seen kits in the craft department at WalMart that has the piggy bank already made, and it comes with paint to paint it. This is one that doesn't have to be fired or else some of those items can be finished in a regular oven.
Add your voice to the conversation. Click here to answer this question.