Voltage regulation: I need 2x12V DC from 25V DC
There specialized ICs that do this conversion (from e.g. 24v to +/-12), providing what is called a rail Splitter or virtual ground, although really you just need a beefy enough buffer for the current you need. It may a bit more difficult finding a 2A dedicated rail splitter. Here's a typical setup using a power [op]amp.