changing out oil pan while in car- done it?

I guess. I just resealed Vixen's pan recently and I pulled engine and transmission. Out in about 30 minutes with hand tools. I mean seriously. Why work in a cramped space up the farkkin side down and risk a leak? Get it out, put it on the stand flip it over so you can SEE it and do it right. Or don't. It's up to you.