I did it with the engine out of my car.
I would look around for a Factory Service Manual. That's what I consulted when I did mine. Also contains torque specs! Since you're tightening into aluminum, I wouldn't want to over torque!
Also, may I ask why are you swapping pans?
As far as gasket is concerned call your local dealer for that. I believe it is a special RTV (at least it is on my 05) that's not too expensive!
Probably take .5 to 1.0 hours taking your time and cleaning all of the surfaces (if you're mechanically inclined)