There’s no way to know exactly how crowded the park will be…don’t rely on “crowd calendars”.
We stay offsite, so we can only do 30 days. To add to it, we’re AP holders, so we can only book 7 days worth…when we take a 10+ day trip, that means often we can only book 7 days in advance. FoP is still a very hard get, and Christmas/New Years week is very, very busy. But every other time, and every ride other than FoP, we can get it same day.
You should be fine.