I know the answer should be obvious 
I've been offered a new job, not 100% sure whether I'll accept it yet. But I've worked in my current role, in a small family business, for 14 years, and it's the only role I've had! The thought of telling them I'm leaving terrifies me, and with staff holidays/Christmas coming I'm well aware of the negative effect it will have if I leave ☹️
How did you tell your long term employers you were going? Were you nervous? What's the best way to go about it?