I did just find an instance of some pretty significant healing in the book
Harry's Godmother healed him after a confrontation with the Nightmare in the third book
but considering who did it, it may not be something that is in the reach of PCs.
You or your GM will have to wait until you have the game in hand, read our discussion of why it might be tough, and then decide if our ideas of why it's tough hold water in your version of the Dresdenverse.
ah well, we'll have to be patient.