The floor jack is simply used to SUPPORT the control arm. What's the difference whether it is supported by a jackstand or a floor jack as long as you don't actuate the floor jack?

Actually when I think about it, I don't think I supported the car on jackstands. I simply placed the floor jack under the control arm and raised it enough to remove the wheel. Then I removed the nut on the top of the shock shaft and the bolts from the spindle and removed the shock leaving the strut mount in place.

It's really not that difficult doing it this way. The hardest part is getting the front shock compressed to get it in place. I can't remember how I did that. Maybe I have to retract my statement about actuating the floor jack. Maybe I raised the shock into position with the floor jack after bolting the bottom in place. I don't remember, but I never used a spring compressor. I've replaced them three times, but the last time I might have done on my two post lift, I don't remember.

Doing it on a two post lift with a transmission jack would be easiest. With a transmission jack to raise the control arm it would be much easier.

When I'm doing something like this, I just analyze as I go and do it.

Good luck,