A tip for removing textured ceilings is to use a manageable sized scraper, preferably 6 inch. Wet the surface using a squirt bottle or a pump sprayer prior to scraping to help make the process easier.
When tiling a pebbled shower floor, you want to dry layout and cut the floor before mixing your thin-set mortar. This is to ensure the fit and placement of the sheets of pebbles so that way you are not scrambling to cut the tile while trying to lay the floor.
When tiling the top of a niche, use supports that are slightly smaller than the opening and wedge them to where you need them to be. This will hold the upper tiles of the niche in place while the thinset/mortar dries.