Carefully measure the room to find the middle of the floor and mark this initial starting position with a pencil. Starting with the corner of a tile on the midpoint, position tiles towards one of the side walls. Don’t stick the tile down at this stage. If this results in a narrow gap between the last tile and the wall, move all the tiles away from the wall by about half a tile’s width. Adjust your starting position mark by the same amount. Repeat this process of laying tiles from the starting position to one of the end walls and adjusting the starting position, if necessary, to avoid having to fit thin strips of tile. Once you have established the starting position, measure carefully, then use a straight edge and draw a pencil line parallel to the nearest side wall. From the same starting point, use a combination square and straight edge to draw another line perpendicular to the first, which will be roughly parallel with the end walls. If you are using self-adhesive vinyl tiles, peel the paper off the first tile to reveal the self-adhesive surface. If you are using tiles where you apply adhesive yourself, be sure to follow the manufacturer’s instructions. Place one corner on th...