As a designer, it's easy to get lost in the polish of the app. Even though you've got the functionality right, sometimes there's always a little more that you can do to make it better, and that's one of the challenges that I constantly get stuck in.
I've spent a fair amount of time working on a directory slash magazine app, which is where I'm going to be documenting the 100 apps that I've built, or I will be building. But while I've been building it, I have been tweaking and tweaking and tweaking and tweaking, and that's something I need to get better at not doing to execute with a little less polish but ensuring there's completion and then move on to the next step.