When you expect writing to be easy all the time, you will be frustrated, because reality will eventually prove you wrong. When it does, if you hold on to the unrealistic expectation (“this should always be fun”), you’re going to spiral into an emotional funk when you can’t make it fun. Or you’ll try everything you can think of to get the happy back, which will cause its own kind of stress when it doesn’t work (because you will have attempted to fix the problem and failed, which is worse than just having the problem in the first place).