My son got his transmission fluid changed a few weeks ago on his 2001 Sunfire. He came up with an innovative way. Drive on a road you aren't familar, bottom out the car, put a hole in the transmission pan cover.
The whole thing happened less than a couple of miles from our house. Most all of the fluid leaked out all over our garage floor. He was driving home late at night, parked it in the garage, and never noticed. Obviously most of the fluid was still in the tranny the short ride home, as was evidenced by the huge amount on the garage floor...which greeted me when I got home around 2am that next morning coming back from the airport. Woke my son, he fessed up to the whole thing, but admitted he didn't realize he "hurt the car."
Anyway, a tow from AAA, a new cover, seal, pump, and refill and he was good as new the next day. We really need to get a good floor jack so we can do that work ourselves. Filling with the new fluid would have been a PITA, though.
The garage floor will never be the same. The 20 year plan is to clean it good and paint it, then throw down flecks.
Oh well. I can remember when I was 17.
Change your fluids...
TJR