Are you doing this on the ground or on a rack?
Hello I'm Chris a Ford Certified Transmission specialist.
Thanks for asking your question. I am eager to get your vehicle back up and running correct, I am here to help you out for a small fee far less than a dealership, so if this information is of aid PLEASE PRESS ACCEPT and help me out financially. Please reply if further discussion is needed.
To service the transmission all you do is drain and fill it. Measure the amount of fluid drained so you have an idea of how much to reinstall. The fluid level should be between the fill and full mark with the trans hot and idleing in park.