Lukas, I asked a similar question regarding the screen of my B20 and was given the same advice .... it was also added that it is advisable to have at least one person available to catch the screen as it detaches itself from the car !!!! And also cloth padding to protect the paintwork of the area immediately below the screen (if it's worth protecting which mine wasn't!!)
The other point, well made, was that, if the rubbers are scrap, then cut them back with a 'Stanley' knife and, lo and behold, the screen may be simply lifted out. This was the route that I chose and it was a dream.
Good luck,
Andy