Plaster walls, done in the first place, and require special skills. You need to prepare a solution of cement and sand. We need to interfere with 3 shovels of sand, and 1 shovel cement. After adding water, we mix solution.
Now, you need to make the beacon on the wall. We need two great snipe, one is nailed on top, the other below.
Then put a profile on the great snipe, and measure the curvature, using a spirit level.And then, fasten beacon to the wall.Like that.
after installing beacons and checking by level, you can start .
you will need a trowel and skills to work plasterer.Next comes the grout wall
Nothing complicated, GOOD LUCK.