Hello,
The best advice I can give is to read the Install/Upgrade guides, and always have the documentation related to the product offline with you, especially when you're on a customer site.
Below is a link to the Install/Upgrade guide of UCCX 10.0
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cust_contact/contact_center/crs/express_10_0/installation/guide/UCCX_BK_IAE57B43_00_install-and-upgrade-guide_10-0.html