Carefully i broke one dead easy
The plastic rear vent needs to come off, and then you will see a couple of screws,The interior trim needs to come off then you will see some more screws, then you will need a sharp blade to cut all round the window to free the sticky stuff,This is the hard bit, you think you've done it all then push on the window and it breaks

Just be carefull and patient don't put too much pressure on

,make sure you've cut all around

,and check for hidden bolts
bit basic but thats it really