I need to do this job too and haven't been able to find a detailed how to either. As far as I can tell, it involves removing the door cards, drilling out the plastic rivets to separate the trim board, peeling off the old fabric, clean up the board thoroughly, apply new fabric with appropriate adhesive, reattach trim board to door card using pop rivets or screws, reattach door cards to the car.
Here's the back of the standard door card:
One with the trim panel reattached using pop rivets (I think):
Another with the trim panel reattached with screws:
I took the last two pictures from these YouTube videos:
https://youtu.be/qhV9UVSeyzs?si=SQTJxHEm7kMOoQTq
https://youtu.be/PBHO8D0J--k?si=nRjABZTh_6Oo3dYG