First Rated show March 21st?

Ok, So i am doing my first rated show with lucky. (WHO IS NOW MINE) i was wondering what should i do to prep him? i know bath, braid mane and tail, clean all tack i have a fancy stitch bridle and martingale. and all that but is their anything i am forgeting. I have a show jacket, tall boots, ect... What makes a Rated show better tehn schooling just higher compition and harder judging?