I had to be away from my 15 month old DD last month, overnight. My biggest worry had been her bedtime, because she nurses to sleep. However, she was fine - a little irritated, initially, that Daddy had no booby, but quickly got over it! :LOL
I took my hand pump with me too, although I hadn't pumped in months. I did use it, although I didn't feel terribly engorged.
I'm sure you'll do fine!