Only a professional master will be able to lay tiles. Do not do it yourself, after reading the instruction.
The amount of material is not to count alone, unless with a margin. It should be noted that when starting to lay, you need to measure the walls with a level. Clean the surface and make it even, and then primed.
If you need to put the tiles everywhere, then you should start from the floor, gently closing the joints next to the wall. Further from left to right, the wall part is carefully glued. It is necessary to withstand for some time to dry. On the tile with a pencil, it should be noted where the places of cutting or cutting are required and break off.
It is not recommended to do this in a suspended position or after gluing to the surface. If you need to follow the drawing, it is better to immediately depict it on paper or put it on the floor, since if symmetry is not observed in the laying process, it may be violated. Before installing tiles, you should pay attention to its color and shade.
It happens that it does not match. Remember that if the house is new, then it can shrink, which contributes to the violation of the structure and the possible breakdown of the tile. Care for household soap.