Moving from 2010 to 2014.

I'm moving from 2010 to 2014. I'm glad to know that 2014 will still backup servers with the 2010 agent installed. I will have a 2010 and a 2014 Backup Exec server running during my transition. When it comes time to finally update the agents from the 2010 version to the 2014 version, what is the proper way to do it? Do the old agents needs to be uninstalled first or can you just push the new 2014 version from the Backup Exec 2014 server and it will automatically update?