The transmission change is easy. You just get under there and simply take the bolts out of the pan. Take them out evenly and drop the pan evenly. Don't pull it harder on one side than the other. My friend warped his pan like that and it leaked fluid. The fluid simply pulls right out of where it sits. Usually there is an o-ring that seals them in there. Simply replace it by pushing the new one back inside. Then clean the gasket surface with some brakekleen on a rag, and use a razor blade if the old gasket material is still being stubborn. You want the surface as clean as can be. Then lay the new gasket on the pan, and reinstall the pan. Tighten bolts cross pattern like a 5 lug wheel. Check torque specs on them. They won't be too much.
There is a ruber plug on the bottom of the bell housing that you can remove. You will have to take the inspection plate off as well, and turn the motor over by the flywheel. You should see a bolt on somewhere on the edge of the torque converter that you can take out. This is what drain the converter.
