Be sure to cut the leg holes larger than you think. Their feet are huge relative to their legs. Also you want them to be able to walk out of it whem you sit them down. You don't want the bandaged foot to get stuck or they pull it off or get tangled up and panic.
To get them out just set them down gently in their cage and let them simply walk out!
You'll want plenty of space between the front leg holes and the edge of the sling. You don't want their head hanging out. The edge of the towel could choke them.
I put them in head first from the back of the sling and set them in it. Usually I can get one back leg in while putting them in. Them I lift the other back leg and put it in the hole. The front paws are more tricky... They can pull them out pretty easily until its ALL the way in.
Give plenty of head rubs, gentle words and try not to rock them around too much. It's easy to be doing something, let go of them as you turn away and they sway around.
Not all piggies are content to just chill in it. You may need to use clothes pins to sinch up the top and keep them snug.
Bacon, the baby bore who had the bumblefoot, was content to just hang out. Pugsy, our other fluffy bear, is a wiggle monster! I put him in to clip his nails and he could pull his legs out and would try to escape.
So if you use one of these do NOT leave them unattended. Be sure to keep them secure. We haven't had any accidents but I could see how it could happen.
Other than that its been great! Pugsy is fine once he's snugged up. Much better clipping him this way.