Gently picking them up to place them back after feeding is ok, just don't play with them. Some of mine I just gently dump back in from their container, since they're skittish and nippy. If the container is small enough, you can set it in the cage without the lid and let them come out on their own. Just be sure their cage lid is on tight so they don't escape.
I usually wait until 72 hours after feeding since there's usually a decent lump still left after 48. Also, I keep my handling very short on the first night because otherwise I get poo'd on.