Women in Technology

First of, I’m a total newbie in this stuff, so please be nice to me! :)
The install seems fairly straight forward and the instructions are clear BUT:

After installing the package, when I try runnig the “sudo ./scripts/mysql_install_db” I get this:

Password:
Preparing db table
Preparing host table
Preparing user table
Preparing func table
Preparing tables_priv table
Preparing columns_priv table
Installing all prepared tables
ERROR: 1062 Duplicate entry 'localhost-root' for key 1
ERROR: 1062 Duplicate entry 'localhost-root' for key 1
020630 9:50:49 ./bin/mysqld: Shutdown Complete

This ERROR thing at the end doesn’t look too good but I don’t give up! I still follow the instructions and change the owner with “chown” etc...: Then, when I run the “mysql test” I get this:

ERROR 2002: Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

To try to get a clue on what’s going on, I look at the error log:

[localhost:local/mysql/data] dabest% tail localhost.err

020630 09:59:04 mysqld started
020630 9:59:04 Can't start server: Bind on TCP/IP port: Address already in use
020630 9:59:04 Do you already have another mysqld server running on port: 3306 ?
020630 9:59:04 Aborting

020630 9:59:04 /usr/local/mysql/bin/mysqld: Shutdown Complete

020630 09:59:04 mysqld ended

OK, this error log looks pretty consistant with the ERROR from the install (although the author says lower that it's a message that can be ignored, I just mention it in case). BUT, as I said, I’m just trying to follow the instructions and I have no idea how to fix that or what it means. Looks like I got twice the same thing but that’s the first time I try installing MySQL and I’m not on OSX Server so I don’t think it comes pre-installed... I don’t know how to check what’s using this “TCP/IP port” and even if I did, I wouldn’t know what to do about it...
What to do? Help anyone? Thanks!