Decide what you'll use. I went with Redline MTL (M
ubricant) Find more about what I used here
So, get your stuff
Then lift up the car (in my case that involved cleaning up the bay so my tech would let me use his lift
Locate the transmission and drain plug
Unscrew the drain plug and drain all the dirty fluid out
Then, tighten the drain plug up, unscrew the fill plug and use a pump to fill the transmission back up with the new fluids.
Once you see it overfilling, you'r done, let the excess drain out, tighten everything back up, and call it a day