If you can run to the extra expense Robin, invest in a trim button tool. It's like a screwdriver with a slot in it, slide it in so the trim button sits centrally in the slot then lever it to pop the button out - much less risk of breaking the trim buttons that way!
https://www.ebay.co.uk/itm/4pc-Trim-...9/121354708777
That's a set of 4 for about half what i paid for a single Snap-On one about 30 years ago! Well worth the investment, if only to save the frustration of broken trim buttons!
