i`m a major diy guy, but i took mine in for the flush, and its not cheap. but its the best way to do it. the filter screen doesnt really need to be changed. if there are no signs of leaks, there no reason to drop the pan.
you can drop the pan, and replace a good bit of the fluid with a hand pump and special fittings, but checking the level and getting it right is complicated and messy.
05 V6 auto,
"The V6inator" torch red, base, amustangrocksleather padded leather armrest, shift boot and e-brake cover