ST4S Rear shock rebuilding/fitting to S4

Just bought a used ST4S rear shock. I heard that it'll fit straight on my S4? Apparently they're an Öhlins unit with remote preload adjuster.

I'm a fairly accomplished mechanic, I'll tackle pretty much anything, just looking for tips as to how you support the bike when removing an fitting the rear shock?? Clearly the rear paddock stand won't be much use, or can I still use that and put a jack under the engine?

Also, do you think it's worth getting it rebuilt/revalved before fitting it? Is this something I could do myself? I fitted new seals and oil in my front forks no problem, just not sure on the actual mechanics inside a rear shock.