Power door lock does not work with remote - need help!

Power door lock does not work with remote - need help!

I have a 2005 Honda Accord EX with power window locks operated from a key fob. One of the doors has a problem with the locking mechanism and does not respond to lock/unlock key presses from the fob. I need to manually lock and unlock the door. How do I fix this? Is it easy to do by myself or do I let the dealer fix this? Do I need to go to a dealer for repair or can I go to any car shop (probably cheaper?) to fix this problem? Thanks!