I have an 04 Pilot and the front passenger side power door lock will not operate.
I believe it is the internal mechanism, but not sure. How difficult is this to remove,
and how do I do that? Thanks

 

welcome to the forum, have not done work on a pilot, but on a accord, and aerostar. not difficult to do, get a door panel removal tool, (looks likea screwdriver, bent with a wide tip blade and slot in the middle of the blade tip. Local car parts place should have it. If you have a service manual or the local library should have pictures, this will help you. once you have the panel off, you have access to the solinoid to the door lock and the back side of the switch. 4 yrs old could be the switch unless you live in a rainy place and the water got into the door panel area.