I would highly recommend getting yourself a trim removal set, I got one from eBay for around £10 (UK) and it will stop you from marking your trims.

Hard to tell from your picture, but they look like the ones where you have to pull out the centre (cross head section) which frees the clips inside so you can then remove the larger clip. The trim removal set will have bits made for doing exactly this.

Cheers

Cris