Comically easy. ~5mm allen for the drain plugs (drain the converter too, have a few beers while it drains) and 13mm for the pan bolts.
I find one of those goofy 90° offset screwdrivers works best to remove the filter, should be three screws. Drain old filter well and recycle it too. Should hold about 6-7tq of DexIII. Only additive I trust is LubeGuard.
Also, perfect time to drain the motor oil for a change and rear diff.