Übermensch and Nihilism

This I posted in the Orkut Nietzsche community:

When I read some of Nietzsche's books, I understood that the state of übermensch is achieved when one can live free from human values.

These values are mainly the result of fear (or the will of power over others) and constitute the herd instinct of humankind.

The übermensch would be strong enough to overcome this fear and these values and still enjoy life.

I think that in different books (and sometimes in different parts of the same book), Nietzsche's optimism or pessimism on whether this achievement (living like an übermensch) is possible varies a lot.

Some of my doubts:

* Do you understand the übermensch concept in the same way I did?

* How much nihilistic is this interpretation of the "übermensch way of life"?

* Could someone define the various kinds of nihilism?

By the way, I read "human, all too human", "além do bem e do mal (beyond good and evil?)", "a gaia ciencia" and "thus spoke Zaratusthra" in this order and in portuguese... And now I'm trying to improve my German in order to read the next books in the original language.  Posted at 20:31