If I'm not mistaken the A-pillars of our cars are made of a partially martensitic material called usibor (tradename). Basically this stuff is the same thing they use in doors to prevent side impact intrusion to the passenger compartment. This stuff has to be heated to 1700 degrees to form it and then quick quenched to form the martensite grain composition. I'd be surprised if they could pull it fully back into shape without severly weakening the material. More than likely there will be plenty of bent pieces that they will just enlarge the holes on to reweld (BAD idea) and make it fit as close as possible.

I'd spend a LOT of time at the repair place to see that it's being done properly!