When it comes to curbless showers, the first thing you need to do is create a slope. This can be done in a few different ways, but the most common method is to use a power miter saw. You'll want to set the blade at around 45 degrees and make sure that the depth of your cuts are consistent. Once you have your cuts made, you'll need to install a drain in the lowest part of the shower floor. After the drain is installed, you can then begin tiling the shower floor. Start by laying down a layer of mortar and then setting your tiles in place. Be sure to use spacers between each tile so that they are evenly spaced apart. Once all of your tiles are in place, you can then grout them and seal them with a waterproof sealant.