pm sent about compressor availability.
Fasteners for the links get tightened with wheels on ground or supported so that weight of car is loading the suspension in driving position.
The amount of force needed to free the subframe bolts could be enough to topple the jackstands, so as stated above I'd have the front wheels on the ground. Additional belt and suspenders approach is to use a long pipe as your breaker bar extender. You can really pull on it when it extends out from under the car (puts you out from under also
).
Can't help with the diff mounts, never did them.