Before you pay someone who claims they "are top notch" to completely fuck up your server, check out:
http://wiki.centos.org/
http://www.centos.org/docs/
http://mirror.centos.org/centos/4/docs/html/yum/
Why pay to have your server fucked up when you can do it yourself for free. Seriously, it's not rocket science. You just need to be able to read the docs.
Google is the best teacher you could ever want and I doubt that any sysadmin on the planet would dispute that claim.