The pan gaskets are also all rubber/steel these days, I'd reuse that unless it gets badly damaged. Wipe the area along the pan gasket well, not far above, just the gasket area, and the pan itself. It takes a large pan to catch the fluid well, and the big 2x3' steel flat pans are great to put underneath the catch pan. The ATF should be very transparent with low mileage on it, and should be easy to conclude it's clean, or spot anything in it.
The pan bolts and the filter bolts are small, filter bolt will be about 100inlbs, pan bolts maybe 15ftlbs. I also do them by hand, my best method is to use just the wrist, twisting without the arm to tighten. Use a small ratchet only, 1/4" works better to keep from getting them too tight. Go slow on the pan bolts and go around 2-3 times, skip every other bolt etc, until they are all snug but not locked down tight.