Place your hands in any position that is comfortable. Any form is all right. This can be quite helpful, but is not absolutely necessary. Meditation is turning off your thoughts or making your mind a blank. Inner quietness is experienced in meditation, but not by willfully turning off thoughts.
Meditation is difficult and takes tremendous discipline.
Meditation is only difficult if one tries to do it perfectly, which is not really possible. Meditation is not successful unless we see interesting things in our mind. Although some meditations are specifically for visualizing, many are not. In those meditations, seeing things may be entertaining, but is not essential. Even visualization does not necessarily require seeing.