As said above, make sure their husbandry is all correct and their living conditions are ideal. After that, it just comes down to putting your hand in there and pulling them out. Pick them up from the side or back, not head-on. Be slow, but assertive, no jerking movements. Once you have them out, sit down and put them on you lap or in your hands and let them get relaxed until they're ready to move on their own.
Was someone else caring for them during the times you are away? Do they handle them at all? Hopefully someone was feeding them in your absence?