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You cannot tile directly over hot mop waterproofing because tile requires a smooth, solid surface to adhere properly. Additionally, the shower bed pan needs to be raised and sloped toward the drain to prevent water from pooling. However, you can hot mop and apply a sloped mortar bed over the top (to which the tile can then be adhered). 

Technically, you can start tiling in a corner and work your way out. However, it's not traditionally how tiling is done. Instead, work from the bottom middle of the wall. Tile out the entire row with whole tiles before moving on to the next row. Once you finish installing all of the whole tiles, then you focus on tiling the corners.

You can technically install tile over tile, but we don’t suggest it. Installing tile over any surface that isn’t a completely flat and prepared subfloor will result in a shoddy overall job, uneven flooring, tiles that don’t adhere, extra weight, gaps, cracks, and room for moisture and dirt to enter. For the best results, only install new tile on a flat, sanded surface like subflooring or concrete that is prepared for tile.

If you have asbestos tile and would rather tile over it than remove it, or if your existing tile is completely flat and bonded tightly to the floor, you may be able to tile over existing tile. But experts recommend thinking twice before you do.

Yes, it’s possible to cut tile without a wet saw; instead, you can use an angle grinder, a glass cutter, a snap cutter, tile nippers, or a rotary tool with a tile-cutting blade. A manual tile cutter or snap cutter works well for the larger tiles that wet saws are typically used for, while smaller projects might just require nippers or a glass cutting wheel. If you’re working with large quantities of tile, however, power tools are best.