Breathe and relax before you do anything - the best possible advice
Something I guarantee you will only neglect/forget once!
Lower the cotton pickin' TV antenna!
Yep. Been there. Done That. Had to make the repairs myself.
Last thing I do before I saddle up and put on that seat belt is to walk around the entire rig. Just look at it in detail, like doing a walk around preflight inspection on an airplane. Does anything look out of place. Any tools left on the hitch or step. Is the step retracted. Wheel chocks. etc. And I'll be honest with you. I am a man of faith. I'll be saying a little prayer for safe and enjoyable travels and PLEASE God, let me remain patient.