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Keep the furniture in storage or an adjacent room until you cut and install the tiles. This will give you a clearer view of the room to ensure accurate measurements. Vacuum or mop the floor as well, and throw away any trash or debris covering the ground. Beginning from the center helps you keep the tiling pattern balanced. Mentally divide the room into 4 different quadrants and start measuring in the approximate middle. Finding the center is easiest for square or rectangular rooms. If your room is oddly shaped, start in the approximate middle. If you are adhering many tiles, making layout lines on the floor can help you make the tile patterning even. Use a tape measure to record the length and width of your tile. Make this measurement your guide as you record how many peel-and-stick tiles you will need to cover the floor. Beginning from the center of the room and outward, use chalk to record where you will lay out the peel-and-stick tiles. While measuring the layout lines, mark them in chalk to use as a guideline when you cut and adhere the tiles. Make partial lines around the sides and corners of the room so you know what shape to cut certain tiles.

Summary:
Remove all furniture from the room before measuring the space. Start from the center of the room. Measure the tile layout lines, if desired. Use chalk to mark the layout lines.