Steps to upgrade a NBU VCS cluster from NBU 6.5.6 to NBU 7.1.0.4

We are upgrading from NBU 6.5.6  to 7.1.0.4   We run NBU in a VCS cluster.   I have read the instructions in HOWTO44632.  In particcular, I am interested in where the clients (installed clients on the masters) and the upgrade (after 7.1 is installed) fall into the procedure ?

Thanks