Hello Merceline! If you have dining room chairs that you can easily remove the seats from your project should be an easy one! Here is an tutorial for you to check out!
Here's a good tutorial: https://www.youtube.com/watch?v=wCcr8MYYBHo
Here is how I recovered our chair cushions: https://thehoneycombhome.com/reupholstery-and-vintage-chairs/
Here is how I did it: https://www.aratariathome.com/blog/dining-room-chairs