Work on Mosaic piece.
In order to create a mosaic. First comes design and preparation of its location. Once materials are gathered, tiles need to be broken down and there are many ways to do that. From been sawn, cut, broken with hammer to letting gravity do its work. As long as You keep it safe, nothing else mater too much as all imperfections can be filed away. You just need to think about how much time you have.
For Slackbuie project we have 2x2m stencil where we will assemble most broken tiles on first for the image fine details as that would be more difficult to be done on site. Than they will be moved to site and glued accordingly like a large puzzle. Finishing with the grout and make surface weather proof and anti slip it will look great.
Short tile breaking test video