Not very hard by all means if you have a few basic hand tools, a torque wrench and ramps or a jack and stand to lift the car up...

About 95% of automotive automatic transmissions do not have a drain plug, so you have to remove the transmission pan to drain the fluid, and the filter is up under the pan anyway. Remove all the pan bolts, drop the pan, make sure you have a container ready for the oil under it... If you buy the filter/pan gasket kit and you look at the filter it should be a pinch to spot. This is what your particular filter looks like (from the top)

Replace the filter, clean the pan/transmission mating surface with emery cloth, scuff pad, or whatever needs to be used to get the metal clean again (without removing too much material eg. a grinder would definitely cause a leak).

Reinstall the pan with the new gasket (do not use silicone or any type of fluid "gasket maker" Automatic transmissions have a lot of tiny oil passages which can easily be blocked by these products and cause severe transmission damage)

Torque the bolts to the manufacturer's spec (you don't really need a torque pattern, just start from the middle of the pan and alternate from side to side (this is to make sure the pan seats square with the transmission body)) 90% of the time you could tighten them anyway you want and wouldn't have a leak but you want it done right the first time so don't take any chances (you should be able to get the torque value from the parts store where you get the filter/gasket kit). I'm not able to pull out an exact spec for you right now.

Fill the tranny up, then drive th