I wrote a post on installing VMTools on Fedora17: http://theeagerzero.blogspot.com/2013/01/installing-vmtools-on-fedora-17.html.
Process should be the same. Try yum -y install kernel-devel instead of kernel-PAE-devel. I'll test, but from what I've heard, the process is the same in 18 as it is in 17.
Hope this help,
mike.