I have recent experience of this having just fitted the Inpro smoked indicators to mine. It takes about 10 minutes to do one mirror. The hardest part is popping off the casing but other than that its just a case of removing several screws.
You start buy pulling the mirror glass out, remove a couple of torx screws to remove the motor (circular plastic disc that the glass clips to). Disconnect the motor wires. Then if memory serves you pop a couple of clips to release the painted cover vertically. Then a couple more screws to split the remaining mechanism away from the lense and finally a couple of clips to release the lense itself and disconnect the wires again.
Easy!
Just take you're time and don't force anything.