The answer I got was perfect and I've been easily toggling Do Not Disturb every day since, and this opened my eyes to another possibility.
I found that while DND was active, I could still view my notifications whenever I wanted by clicking on the Notification Center icon. This is fantastic as I'm not interrupted by notifications appearing on my screen, but I can manually check them when I want.
Now the catch! As that answers correctly says
NOTE: Do Not Disturb will stay active until the next day (when it becomes inactive again) or until you once again hold the option key while clicking on the Notification Centre icon.
What I'd now like to know is if there's a way for me to just make DND active 24/7 so I don't have to keep enabling it?
I did check in System Preferences > Notifications and I can set it on a schedule but there is no option to just enable it and forget it.
How can I turn DND on until I manually decide to switch it off?