All you do to install is remove your door interior panel, drill a couple holes in your door steel and bolt this thing right on. It comes with a variety of adapters to fit various manual crank window splines. You do not unbolt or touch any of the factory manual crank window regulator. If you google image search "universal power window install" you will see pics that make it clear. The drive cable is flexible so you can locate the motor where you have an opening in your door frame so it doesn't interfere with your interior panel.

I installed mine 10 years ago and still going strong. Back then, the basic model did not allow you to manually actuate the window with a crank, however the deluxe version did. I just got the regular version and have never had any sort of issues with it.