No, writing is fun.
Well, you do have to follow strict rules and guidelines.
And sometines you want to write X, but first you need to write T, U and V even.
And then there's writing an interesting thing about a character, but then you realize that it won't work with this other thing.
For example, SFD has the afflection of not understanding human numbers. More than once, I had wished I didn't do that. If I tried to take it back now, we are talking tons of re-write. So be careful what afflections you hoist onto your characters.
Also, there is the good-line syndrome, I call it that, just now.
You're writing along and bang, I great line occurs to you. The problem is that the perfect character to say that line, just spoke the set-up for that line. Either re-write, or have the character realize the set-up, or easier still, give it to another character that it sort of fits. Maybe as a get even kind of deal.
Then there's the description, I usually ignore. I figure that this is CoX, you know what Atlas Park looks like, geez.
For other things, you can get trapped in too much or too little description. Readers want to read action or story, but they need description too.
One last thing, I started writing this fan fiction crud about a year ago, and that makes me an expert.
Well, I do have a BA degree, so that counts too.