In some forums about feeding they say that some can go up to 4 weeks without pooping. But usually they poop once or twice a week. Most the time you'll just find uriates. You will know when they poop. It smells terrible.
When you pick them up just grab them near their midsection and place her/her on your hand or whatever. The are terrestrial animals so they need support for their long backbone. As long as you keep them supported ( which isn't hard to do) your fine. They usually get themselves comfortable.