How to remove chrome gutter trim ?

Won't it vary depending on the car? For example on the Viva HC, this is the way:




I used a screwdriver levering against a small wooden block to remove the bottom edge of the trim strips when I did mine as I didn't have the special tool. But it's important to only move it a little at a time to prevent distortion.

I presume installing is a simple push click ?

For Viva it's as it says in the scan, hold it against the bottom of the drip rail and hook it over the top. I think from memory I did mine the opposite way, hooked it over the top and pushed the lower into place. I have some bits where I have to glue it in place, because I'd done a lot of repairs to the edge of the roof (as it looks like you need to) and the drip rail wasn't quite the right height.