Your wall should be strong and flat, surface should be smooth. Preferably the wall should be waxed / printed. And it should also clean and dry, if the tiling has to be done on plywood the surface of wall should be sealed with 50% volume mixture of PVA and water.
Mix the tiles from different cartoons which will help in fine blending of shades.
Firstly, apply the high quality ceramic adhesive on the wall and place the first tile on the corner. Apply even pressure on the four corner of the tile to ensure sticking. Fill the area of wall that can be filled with the tiles without cutting and leave it for at least 12 hours. Fill the rest of area with the measures and cut tiles.
To ensure the proper contact of tile with the wall, evenly tamp the tiles with a rubber mallet tamp.
On the next day, the grouting is done. Apply the grout diagonally between the tiles using a sponge to fill the gaps between the tiles. Clean and wipe the surplus grout with a sponge.
To fit the tile in a curved surface of wash basin etc. Measure and mark the curve on cardboard and place the cardboard on the tile of cut it.