Piece of cake, take the axle out , the bearing race also knock out of the hub aswell, take out the clear plastic insert from the middle of the hub so that you can see clearly the inside of hub you need to straighten. With the wheel ideally lying down onto something that will not damage the wheel and allow the hub to be knocked through,Use something (piece of hardwood, etc)to knock the hub back out into its correct shape, they are easy to do, just don't over do it.
Hope that makes sense.....