I don't know anything about cars but found this easy and done in less than 20mins.

Firstly credit to the orginal poster who posted this method in a thread a while ago.

Secondly you don't need to remove bumper or battery, just 6 normal cross head screws and wheel arch shield

Lastly pitures paint a thousand words so I have done this guide in piture form. Click on each picture to expand and read the text.

The was done on a '52 5 door Abarth and all access was from the wheel arch.