I hate this kind of thing because I usually screw it up. Searching around youtube I found this guy who did a pretty good video (I think) of how to replace the actuator. Before I head down this path, I just thought I would share this with folks to see if anyone had any commentary before I got started.

 

Good video, not a hard job, not really any "watchouts". While you are in there be sure to lube the window tracks liberally with heavy wheel bearing grease.

 

Take note of where the plastic clip is on the rod that hangs down from the door handle and where it attached onto the actuator. Easier if you remember where it was (low or high) for reassembly.

 

Youtube is also a better option before hiring any locksmith for your work.

 

To understand the concept of lower and upper assembling, you need to talk to the locksmith expert about it.