Floating Shelves installation can be pretty straight forward and then it can't be. In most cases the customer has already purchased the shelving and It just needs it to be installed. Some walls have tile or wallpaper that can be a factor, in these cases I will be vocal with the customer on the best ways to handle it. Some tile is just unforgiving and will break with the slightest tension. If you're thinking about installing a floating shelf on a tiled wall please consider that potential issue.