There was a prior post regarding tiling over existing wall tile. I'm interested in tiling over existing floor tile (1950's home). I'm assuming if the tile is mechanically sanded, or otherwise (suggestions?), to remove any residue I can tile over the existing? The room is so small, I have little room to work to remove existing.

Never done a bathroom before, so only question I have pertaining to tiling a bathroom is regarding setting the toilet after adding a layer of tile. Is there a part to raise the soil pipe and attach new flange? Would hate to go through all the effort only to not be able to properly set the toilet. Thanks in advance.