After deploying the Avaya Oceana Cluster1, the cluster will initially be in the Deny New Service State. To complete the installation process, it's necessary to change the Cluster1 attributes to the desired values, ensuring the configuration is correct. Additionally, it's crucial to change the Cluster1 status to accept new service after reboot to enable the cluster to start handling new service requests. Rebooting the nodes may be a necessary part of the process, but the key steps are configuring the attributes and changing the status to accept new services.