I think my grandmother's point wasn't that we should only choose to work hard at the things we love to do, but to have the attitude that if something must be done then do it well and enjoy the process. That some jobs are necessary. Some are tedious. And some need to be done because you have no choice.
But attitude is the key.
The marketing side of writing is definitely a challenge for me. I know what needs to be done, I just avoid doing it most of the time.
Marketing is a necessary work for a writer. So I guess my attitude's about to change. What part of your job do you avoid?