Just went through this on my Avant - its not that bad - even if you have to pull them to free them up (I did). You may be lucky enough to free them up in the car with spanner wrenches and the suspension unloaded. Good Luck
Unload the suspension, hit them with some liquid wrench, and spin them down/up with a spanner wrench. If you have to remove them I would suggest coating the threads in anti-seize in case you need to make future adjustments.