Installation is quite simple, just follow the Installation Guide. Only thing what is missing, is that you have to set the Environment Variable DYLD_LIBRARY_PATH=$ORACLE_HOME/lib in order to use all necessary utilities (e.g. lsnrctl, sqlplus aso.)
You should also set all mentioned settings according to the Installation Guide, like Kernel Settings and specially ulimits, I forget the ulimits and immediately as I wanted to create a Database I receive TNS-12547 lost contact :-( , just set as the oracle user "ulimit -Hn 65536 and ulimit -Sn 65536" and start the creation of the Database and everything will run :-)
Here you will see, that it's really Oracle 10.2.0.4.0 on OS X :-) (see last line)