My first sweater was a top down pullover (#9724) from Knitting Pure and Simple so I haven't knit their cardigans yet. If you don't mind buying a pattern I highly recommend them though. The pattern was easy to follow. Many, if not most, of them are top down seamless patterns. http://www.knittingpureandsimple.com/cardi.html
When asking questions ALWAYS post the name and a link for the pattern if you have it.
I am a beginning knitter who is knitting a cardigan right now. I am doing the Central Park Hoodie. Again, it is a pattern that you have to buy, but it is so surprisingly easy. Even if you don't want to do cables, you can still make the cardigan in all stockinette stitch.