screw extractor for Ebay .. extract the old screws and while the door is OPEN slide the blade towards rear of the car !
shoud move about 5cm and then the blade shoud fall !
The place the new blade on place slide is toward front on the car and put new screws
then make pics and place them here!
As said it's just a case of screw off, screw on. Genuine one's do go for a fair bit, I've got aftermarket one's but they've held up ok so far and this is the second car they've been on.