I have that awful 70s crazy paving in my front garden, set behind a waist high single skin wall with those black curly metal railings on top. I'd like to remove a single slab of stone next to the wall so I could plant a rose that I could train along the railings. Anyone know how to do this? I have no idea what's under the paving, it's quite possible there's a layer of concrete or something. My garden is raised up from street level so it's possible there's all sorts of crap underneath.