1. No one can predict the future. So just let it rip. Try this thought exercise: what's the ABSOLUTE WORST THING that could happen? If your app spectacularly fails, then what? Chances are it's not much: you're out the time you invested, and maybe a little embarrassed, but life goes on and you try again.

Honestly, the only way to truly fail is to never try at all. So give it your best shot and hope for the best; that's what the rest of us are doing. :)

2. Everyone is making it up as we go along. There is always a better idea, a newer approach, or a brilliant new technique. But the truth is, 90% (or more) of success is just choosing a path and showing up day after day to keep making steps forward.

Be flexible and ready to make adjustments. But never believe that anyone has this shit figured out.

So take a deep breath and submit that app. Good luck.