More regarding removing the clip for the window handle. First, the clip can be installed the other way-- as in you will hook it from the other side (the side opposite the arm w/ the knob on it). If your panel's been removed before, there's no telling how the mechanic reinstalled it.

Second is you can just use a thin rag or cloth to remove it the clip. Wrap the cloth around the ends of the clip and pull.

Third is those clips are notorious for flying off and disappearing. You can buy a pack of replacement at any auto parts store in the Help! section.

Last, to reinstall the handle, you can put the clip on it first. Then the handle just presses onto the splined rod until it clicks into place. This makes installation quicker but it's harder to be sure you have the handle lined up with the one on the opposite door. YMMV. -scott