Photography: Jon Day / Styling: Rebecca de Boehmler / Direction: Sarah Keady Decorating the home for Christmas is always an enjoyable way to start the festive season, but have you been guilty of damaging your walls when hanging up cards, lights and ornaments? Whether you’re going for an Instagrammable hallway or more of a minimalist feel in the living room, there are a few easy tricks to know about when it comes to protecting paint and wallpaper. Maryanne Cartwright, Head of Design at Graham & Brown, has shared her expert advice on how to secure your Christmas decorations without causing any damage. 1. Use over the door hooks instead of…