Hey @Tom_Harris, it’s pretty easy, and I think you could do it without any problem. I covered the process in my Nucleus One user experience article. Scroll down to the section titled Switching to Nucleus One server and take a look.
@Rugby’s directions are solid as well, simply remove the storage drive from your Nucleus/ROCK, install it in the Titan, restore a recent Roon database backup, and you’re all set. You can find more info on creating a backup of your Roon database here.