Tools needed to install lowering springs and rear camber arms.

[BobbyLight]

I had a shop quote me $898 for installing swift springs, SPL camber links, and an alignment. I don't know if that is "high" but I am definitely not paying that.
Plan b, do it my damn self. I've never attempted anything like this, so it should be interesting.

I know I need:
-jack
-spring compressors,
-a metric socket set
-metric wrenches
-a breaker bar
-a vice

However , I had some questions about some other tools.

I need to buy an impact gun anyway, but curious how many ft/lbs you would recommend for this job? Also, electric vs air?

How many jackstands do I need? I only have 2 at the moment.

I once saw on a thread here that I now cannot find that suggested picking up a "box wrench" and an offset wrench of some sort? Are these necessary?

Thanks in advance