Installing a suspended ceiling
To install the main rails that are perpendicular to the ceiling joists, screw 1 1/4" screws every two or three joists. Place them at a distance of 60 cm (24") from the wall and do not screw them in completely. Use these screws and iron wire to suspend the first rail. Use a level to help you tie up the rail to the right height, i.e. same height as the L-shaped mouldings. Repeat this procedure every 60 cm (24"), until all the main rails are installed.
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Installing ceramic tiles over existing ceramic tiles
You love ceramic tiles because they are "low maintenance". However, your current floors leave something to be desired and needs sprucing up. Instead of tearing off the existing ceramic tiles, why not lay down new tiles directly over the old tiles? You would save time and energy!