Having bought some new door cards I needed to fit the speakers. The cards came with an outline on the back where the hole should be cut so as to align with slots in the door frame – I still checked these were correct.
I strongly recommend buying or borrowing the correct size hole cutter rather than using a hand saw or jigsaw. This will ensure a neat round hole.
Also lay the card where you are cutting onto a block of wood to compress and hold firm the delicate facing material as you cut through – otherwise it will tear and damage the facing.