> Does someone have a slick way to get these things off
> and on again, especially working solo?

Well my van is 2WD,.  For the bolt/nut most towards the rear of the van, I used a long extension  on a socket and I could just squeak the extension past the top of the engine compartment.  i.e., it was tight against the hole for the engine cover.  The rachet is now 2 to 6" above the rear floor of engine compartment.

For the bolt, which is facing upwards, the head inside the bracket, the threaded end sticking up and passing through the slave cyl -  I used an standard box end or open end wrench, but I jammed a piece of garden hole into the slot, after getting the wrench on the bolt head.  Then I turned the rachet slowly until the open/box end wrench came in contact with one of the walls on the bracket.  The hose keeps the wrench on the bolt head and also keeps the bolt head tight against the bracket.

For the front one, I believe I used two box/open end wrenches, but I still employed the garden hose idea.

I did not have too hard a time "after" employing this method.

Happy trails.

NOTE****
I would bleed the entire brake and clutch system, or at least the slave- prior to changing the slave.  I didn't do this and after putting in the new slave and brake fluid came out black out of the slave - dark brown at the brakes!   This way when you (re-)bleed the new slave., you are not passing dirty fluid right through the new slave!  I did not use a pressure bleeder, only someone pushing the clutch and brake pedals.  Bled it all, then made a a quick re-bleed all around - no problems since.

John