Finally... submission to CreateSpace

Finally I have submitted the text and cover files to CreateSpace. I expected this process to be all sorts of things but nerve-shredding was not one of them! Not the upload itself, which was very straightforward, but the anxiety over having got everything perfect before turning the Word files into PDF. My only hitch has been with the cover, which was insufficiently high resolution and has now been re-submitted at 300dpi. The 4mb j-peg Kindle cover has inexplicably shrunk to a 260kb full size cover. Is this normal? Will it look ok? There are so many things to be concerned about in this process that I salute those who survive!