October Novel Prep Challenge

We've come to the point of prep where it's time to start looking at what we have for our outline, and then revising it with all our new information. For some people, it looks like the snowflake method, where they begin branching out with their outline. For others, it's a different method.

Now my question is this. For veteran writers: when you write your stories, what is one of the biggest things that holds you back with your outlines? How can you plan for that in this outline revision?

For writers who are a bit newer: what is something you're looking forward to discovering when you perform the second round of revisions?

As always, good luck,
Anders