Yeah, the rear end was jacked up with nothing supporting the rear arm. The shock was fully extended.
I took out the plastic bar link (sway bar link?) right next to and parallel to the shock and that gave me enough room to jimmy the shock out of there.
Once out, I realized it didn't need to be changed at all, after 198k it was still good. Had the exact same pressure as the new ones I'd bought.
Ah well, thanks for the replies...