The hub can be pressed (or hammered out) from the back side of the control arm without the wheel bearing being removed. The wheel bearings are also pressed into the control arms, then a c-clip is used to hold them in place (I highly doubt they are going to move though). Look at the picture below to see how the assembly goes together:

The control arm is not pictured but you can see how the assembly would go.
Bearing pressed into control arm.
Clip retains wheel bearing.
Hub pressed into wheel bearing.
After axle is inserted through back of control arm (and through hub), nut and locking plate holds everything together.
Hope that helps explain it a little more....
BTW....Some people report that trying to remove the hub will destroy the wheel bearing. The inner and out races will separate. Not sure if you plan on replacing both bearings but you should consider it. Besides, if it is this far apart you might as well...