THE HERMIT
In the traditional sense a Hermit is one who isolates himself from society, retires to some place far from his fellows to live his life as he sees fit.
However, in this sense, this is not true. The Hermit, while being a Magician who works alone, does not isolate himself. Rather he ramains in full contactwith the society of the world so that he may work toward the establishment of the law of Thelema.
The reader is refered to the Book of Thoth for more on The Hermit. 
[See Atu IX -- The Hermit]
The Lover, or the 'Brother', is closely related to the Hermit, in that they both are forms of the Logos. The Lover, however, is an initiate who works with groups as opposed to alone. Whether it be a 'circle' or 'lodge' or whatever, the Lover, like the Hermit, works to establish the Law of Thelema.
Again the reader is refered to the Book of Thoth for more about the
Lover. 
[See Atu VI -- The Lovers]
The man of Earth is the Thelemic equivelent of the Shaman. Heis aninitiate who works both alone and with groups to provide Spiritual healing along with the teaching of the Thelemic path.
There is no known equivelent in the Tarot for the man of Earth, save for
perhaps the Aeon. The man of Earth is at the same time a new element and a synthesis of
the Hermit and the Lover. 