[CentOS] Update of CentOS 4.0 to 4.3

I need to update a CentOS 4.0 system to CentOS 4.3.  In my opinion, I
should start out with a "yum update yum centos-yumconf" and then follow
that with a "yum update".  Does anyone have any other input as to what
other packages might be needed to be updated with yum and centos-yumconf
before the mass upgrade?

Thanks,
Barry