as the title says, i know nothing about slings/ front carriers/ back carriers.
i've recently discovered i'm pregnant with DC3, and when this one's born DS will be 3 & DD will be 15 months or so, so i think a sling is the way to go.
i want one with clips, i wouldn't trust myself to tie knots properly 
any recommendations/ brands to avoid, etc
also if someone could talk me through the benefits of a sling, how safe they are (my mother frightened the shite out of me about them when i was pregnant 1st time around) & reassure me that they're really, really simple to attach correctly, it'd be very much appreciated. 