Identify the Damage: Inspect the roof for broken, cracked, or missing tiles. Look for signs of water damage, such as stains on the ceiling or walls, which might indicate leaks.
Check Flashing and Mortar: Examine the flashing around chimneys, vents, and valleys. Also, check the mortar on ridge tiles, as it can deteriorate over time.

Use Proper Equipment: Ensure you have a sturdy ladder, and consider using roof ladders or crawling boards to avoid putting too much pressure on the tiles.
Avoid Walking on Tiles: Tiles can easily break underfoot. Step on the strongest part of the tile (near the overlap) if you must walk on them, or use boards to distribute your weight.

Remove the Damaged Tile: Lift the tiles above the damaged one to expose the fixing nail or clip. Slide the tile out carefully to avoid damaging adjacent tiles.
Prepare the Replacement Tile: Ensure the new tile matches the existing ones in size, shape, and color. This helps maintain the roof’s appearance and functionality.
Install the New Tile: Slide the replacement tile into position and secure it with a nail or clip, depending on the roofing system. Ensure the tile is aligned properly with adjacent tiles.

Regular Inspections: Check your roof regularly, especially after storms, to catch issues early before they become major problems.
Maintain Gutters: Clean gutters regularly to prevent water buildup, which can lead to roof leaks and tile damage.

Consult a Roofer: For extensive damage or if you’re not comfortable working on the roof, hire a professional roofer. They can assess the condition and make necessary repairs safely.
Tiled roofs, when maintained properly, can last for decades. Addressing repairs promptly will help avoid more significant issues down the line.