IUD Help

Sarah
Has anyone had an IUD? The brand I'm thinking about getting is called skyla. I'm really worried about it for a few reasons though. I know there are strings that hang down and I'm worried about those I k ow that they don't hang out of your vagaina or anything but just worried they will get in the way. I'm also worried about passing out or it being painful when it's being put in. And has anyone had one fall out or penitrate their cervix in any way?