Delays in releases etc have always been hard for me to get over. It's not a huge deal, but when an artist needs a break or when you don't have enough time to finish editing you have to push back a release.
I used to have a bad about that sort of thing, but recently I've gotten more relaxed with the idea. Rushing and pushing out a bad cover or poor editing is far worse than delaying it for a month.
That is after all the main point of self-publishing. While it's really important to keep some sort of schedule. (For me is 30K words a month) sometimes it's better to break it instead of stressing out about the situation.