Mona Miller recently placed two short videos on the Monarch Watch Forum that detail how to hand feed and how to remove pupa with water and pin them up:
How to Remove Pupae using Water & Pinning Them Up
Hand Feeding a Monarch Butterfly
Mona says they usually refuse food the first 23-48 hours, but you should lightly mist the container with water. She thinks nature provides enough fats for the new butterfly to allow it to wait this time period before it needs to feed or perhaps it is a period where the new butterfly needs to further mature before it feeds.