Thank you for the replies and confirmation. That let's me know that I'm starting to get the hang of this. I'm actually building three sites at the moment, all in different stages and I'm making use of the various library extensions - so far so good.
I came across a free extension out there that when applied to a div or image, it seemed to just apply small rounded slices for the corners only plus alot of other stuff. Very confusing. These methods here are way better.