I got this done in my 86 Charade several years ago. They ran without problems for 3 years, after that I sold the car. I got the parts from an 88 model, since the 86 was not originally available with power windows. Got the whole thing done from Peshawar. They had to drill a few holes on the doors to get the cables through and to install the motors, but otherwise its not a difficult installation. You need to find an experienced shop to get it done. Inexperienced mechanics will mess it up. Don't forget to install proper fuses as well.
I would highly recommended this upgrade.