July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Piston Disassembly Note
WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
Place a piece of wood in the caliper.
Gently blow compressed air through the hole to force the piston out of the caliper.