Have you bonded with your piggies by handfeeding, being near them and talking to them ? Will they let you pet them? If it helps to know that it's actually quite unusual for piggies to bite. I have 5 and none of them has ever bitten anyone, even strangers or my nephews (and they are not the calmest children). Even working in the sanctuary, none of the piggies ever bit anyone, and they didn't get much handling, so weren't particularly tame. They may sniff your hands, and occasionally they may nibble, but that doesn't hurt. That said, they are animals and they have teeth, so there is never a guarantee that they won't bite, but I thought it may help to know that it's not normally in their nature to bite, they are much more likely to wriggle and try to get away. Now that you know that, try all the other great advice that you've been given about how to pick them up, and hopefully you'll develop confidence with them, and they will learn to trust you.