The vertical level of the screw is controlled with the pipe level, and the horizontal level with a stretched thread or with either optical or laser level.
The second method is an electro-mechanical one with a so-called "electro-screw". There is initially no difference between this method and a fully manual method, except all the work is done by electrical equipment.
The third method uses a hydraulic attachable devices which are installed on various types of cranes, loaders, tractors and self-propelled drilling rigs. The third method is optimal considering duration of this work, as well as of the mounted ground screws. It enables you to set ground screws up to 7-8 meters long. But one has to consider, whether this type of machinery can access to the construction site.
What happens if a ground screw is stopped on a stone? The answer depends on the size of the stone. If the stone's size is like a fist, the ground screw will push it aside and continue to twist further. If its size is larger than a car wheel and it meets at two thirds of the design depth, then it is necessary to trim the top cap and weld it to a new predetermined height.