Anything you try is "difficult" or "advanced" until you try it. Even sewing straight blocks together is daunting at first. Getting yourself to believe that you can do something is most of the battle, I think. If you find a pattern you want to sew, just do it. Use scraps if you think you may have difficulties. You will either create a magnificent block, or you will have some of the fanciest dust rags anyone could hope to have. If you find that you cannot do a block, practice for a while and come back to it. I'll bet you will amaze yourself with what you can actually do.