Rick,
We did this job, it is possible to disconnect the top joint, swing the hub out the way, replace the gaiter and then reconnect it, but we found it much easier to take it all to bits in the logical order and then put it back in reverse. Start at the front, undo everything in order and you can't go too far wrong. We did have a problem getting the brakes to bleed after doing this so you might want to replace the cylinders etc while you've got it all to bits. You can use Series 3 LWB (I think) front cylinders but you have to modify them slightly by grinding a lug off.
Chris