If you can't simply pop the washer off the end, keep the bolts in the hub, and gently tap the non-drive side with a mallet. This should pop the whole axle out.
Then lightly clamp the driver in a vice, and tap the other bolt to push the axle off.
Now you have the driver free! You should still have the hub bearing, and a very thin washer in place... Slot the axle back though, with the bearing in place. You cab slide a socket onto the bearing to tap it in place, or what I do is remove the pawls and springs from the driver, slot that over the bearing, and use that to tap the bearing in place.
That thin washer between the driver and hub bearing is very important! Don't lose it.
You should now be ready fo your 9t driver.
if you have any problems, i'll be taking mine apart soon, so I can get pics of how it's done.