Run System Settings > Add/Remove Applications (if you have X) and start uninstalling. Then replace the 5 in the line
in /etc/inittab with a 3. Then disable any leftover unneeded services if necessary.
/sbin/chkconfig --list | less
will list services.
/sbin/chkconfig service off
turns that service off.
If you were reinstalling it may be a good idea to do a custom install, select only what you want (httpd) and let the dependencies work out the rest. Then you only get what you need.