Help!! First cat 4 race this sat.

Hi everyone! I am a college student in Houston, TX about to race my first cat 4. race this saturday. I have done alot of my training/riding on my own and would love it if i could get people's advice on what to expect in terms of speed/pace and helpful tactics. The race is 25 miles long and i was told to expect some gradual ascents and descents, a couple sharp climbs and headwinds part of the way. I would greatly appreciate anyone's comments/advice/tales of their first race. Thanks! Erin