T.N.
I was given one that was too large for me and it wouldn't hold my baby close enough to me and I had to support him with my arms (defeating one of the purposes of wearing a sling), so make sure you have the right size. I did a lot of research before buying my sling and it works great. I still sometimes wear my toddler when I'm cleaning or preparing dinner and he's bored and tugging at my legs or underfoot. He loves being "worn" and brings it to me. Anyways, after reading up on different kinds, I bought an Over the Shoulder Baby Holder on ebay for $10. www.KangarooKorner.com was a great resource and you can also buy their slings from their website or find some of them on ebay for a discount . They have a page that describes and shows pics on how to wear different slings properly: http://kangarookorner.com/wearing.aspx
Click on what type of sling you have (on the left side there's a list to choose from) and this should help you out and even show you the different kinds of positions you can wear your baby in as they grow.