You have a physical hard drive. On it, you appear* to have two partitions. In each partition, you currently appear to have one logical disk drive: a system drive (C), and a data drive (D).
I think you think the logical drive and the partition it is sitting in, is the same object because the drive exactly fits the space available to it in that partition. Well, it's not, but as a courtesy several third-party tools let you treat them that way on many occasions. You need to re-read FOR's post and compare the number of steps he describes, with the number of steps you think should take place.
Something like Easeus will help you a lot: it will let you arrange your drives and partitions using drag and drop, and mask the number of background operations that entails until you press the "do it" button.
Edit: * by "appear", I mean "in my mind, having read your posts", not "to you, it looks like...but the real situation is different".