Very easy, 5-10 minutes, tools were a skinny flat head to get the 3 screws out, headlight lamp to see the back screw and shop-vac to clean up. Only hard part is contorting your back on the passenger door sill to get to that back screw.
under the glove box, remove the 3 retaining screws on the round black enclosure and it drops down with the fan so you can clean it out, very easy job. (A/C was making card in bicycle spoke sounds at the highest level).