It is not as hard as you might think, but you definitely want to know the right steps before you begin. Before you start drilling, figure out precisely where your fixtures will be installed. You need to plan this out to avoid making any mistakes, which are hard to correct in material such as ceramic tile. You need to get the precision down exactly. If your fixture will require drilling multiple holes, then use a measure tape and level to measure between the holes. Marking the tile is just fine; however, make sure that it can be removed easily.
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